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1 test your power supply with a power supply tester<br />
2 get a POST hardware checker that plugs into your motherboard<br />
<a href="https://www.amazon.ca/SODIAL-Motherboard-Analyser-Diagnostic-Desktop/dp/B00DU673AQ/ref=pd_sbs_504_1?_encoding=UTF8&pd_rd_i=B00DU673AQ&pd_rd_r=c093f9d8-e2d3-11e8-b82c-21b13ea86793&pd_rd_w=EsPHK&pd_rd_wg=lacJN&pf_rd_i=desktop-dp-sims&pf_rd_m=A3DWYIK6Y9EEQB&pf_rd_p=d4c8ffae-b082-4374-b96d-0608daba52bb&pf_rd_r=V09FNA42DJ3TZG4T2W28&pf_rd_s=desktop-dp-sims&pf_rd_t=40701&psc=1&refRID=V09FNA42DJ3TZG4T2W28" rel="ugc">https://www.amazon.ca/SODIAL-Motherboard-Analyser-Diagnostic-Desktop/dp/B00DU673AQ/ref=pd_sbs_504_1?_encoding=UTF8&pd_rd_i=B00DU673AQ&pd_rd_r=c093f9d8-e2d3-11e8-b82c-21b13ea86793&pd_rd_w=EsPHK&pd_rd_wg=lacJN&pf_rd_i=desktop-dp-sims&pf_rd_m=A3DWYIK6Y9EEQB&pf_rd_p=d4c8ffae-b082-4374-b96d-0608daba52bb&pf_rd_r=V09FNA42DJ3TZG4T2W28&pf_rd_s=desktop-dp-sims&pf_rd_t=40701&psc=1&refRID=V09FNA42DJ3TZG4T2W28</a>
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Not great reviews, but this is all I could find in the US. &nbsp;<a href="https://smile.amazon.com/dp/B005J1SUIO?pf_rd_m=ATVPDKIKX0DER&psc=1&pf_rd_p=7ebdab82-de3b-42f2-8032-aa63ae38b0fa&pf_rd_r=2aeaaac4-8c1f-4e74-aec1-4eab91ce92fd&pd_rd_wg=aUq6z&pf_rd_s=desktop-huc-carousels&pf_rd_t=40701&pd_rd_i=B005J1SUIO&pd_rd_w=2ix0U&pf_rd_i=desktop-huc-carousels&pd_rd_r=2aeaaac4-8c1f-4e74-aec1-4eab91ce92fd&ref_=pd_luc_rh_crh_rh_sbs_04_01_t_img_lh" rel="ugc">https://smile.amazon.com/dp/B005J1SUIO?pf_rd_m=ATVPDKIKX0DER&psc=1&pf_rd_p=7ebdab82-de3b-42f2-8032-aa63ae38b0fa&pf_rd_r=2aeaaac4-8c1f-4e74-aec1-4eab91ce92fd&pd_rd_wg=aUq6z&pf_rd_s=desktop-huc-carousels&pf_rd_t=40701&pd_rd_i=B005J1SUIO&pd_rd_w=2ix0U&pf_rd_i=desktop-huc-carousels&pd_rd_r=2aeaaac4-8c1f-4e74-aec1-4eab91ce92fd&ref_=pd_luc_rh_crh_rh_sbs_04_01_t_img_lh</a><br />
<br />
Is this how professionals diagnose mobos???
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It is normally faster and cheaper to just replace the items. Repairing a motherboard requires about $1K of equipment, Microscope, Hot Air Station, Soldering Iron, Fume Extractor. <br />
Getting schematics is a problem. Some parts are proprietary and almost impossible to source. You have to consider your time into the equation. <br />
<br />
Replacement is usually the cheapest option.
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Must be pretty old if you are looking at a PCI rather than PCIe diagnostic card.
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i suggest to disconnect all devices not needed for a basic boot :<br />
all disk and cd drives, external devices, etc... - &nbsp;if there are many, LABEL the devices and cables !<br />
leave only one ram stick<br />
<br />
now it should boot into bios - if not, your PS is probably faulty - you can use a tester : &nbsp;<a href="https://www.amazon.co.uk/PC-Power-supply-tester-LED/dp/B0038MN90A" rel="ugc">https://www.amazon.co.uk/PC-Power-supply-tester-LED/dp/B0038MN90A</a><br />
<br />
Post the motherboard model, or pc model please, so we can give detailed info ! &nbsp;or is this &nbsp;about your GIGABYTE problem ?<br />
<a href="https://www.gigabyte.com/Motherboard/GA-X58A-UD3R-rev-20#sp" rel="ugc">https://www.gigabyte.com/Motherboard/GA-X58A-UD3R-rev-20#sp</a>
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Thanks! It is the GA-X58A-UD3R (rev. 2.0) , Corsair TX650, GIGABYTE GeForce GT 430 (Fermi) DirectX 11 GV-N430OC-1GL 1GB , G.SKILL Ripjaws Series 24GB (6 x 4GB) 240-Pin DDR3 SDRAM DDR3 1600. &nbsp;Its been working great for years. &nbsp;Over the last 2 days, it started locking up. &nbsp;And then, it suddenly will not boot. Lights, fans, all work.. &nbsp;I did the paperclip test on the PSU and it passed. &nbsp;But, I don't know how accurate that is! &nbsp;Is there anything I can do other than visually inspect and smell the mobo? I've ordered the diagnostic tools above. &nbsp;If I get annoyed enough at it, I want to keep most of my hardware, I may just replace mobo, cpu, RAM. &nbsp;I see LGA1151 is current. &nbsp;Any recommendations?
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As Nobus says you can strip it down to basics, it only needs 1 DIMM and no extra cards to boot although I do not see an onboard video port. It my have onboard video, the picture I have is a bit blurry, it has legacy PS2 mouse and kbd!
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it's a pity you don't live near &nbsp;me ..i'd help you in an instant<br />
do you have a multimeter? &nbsp;then you can measure voltages - &nbsp;cost = about 10$ &nbsp; <br />
<br />
<a href="https://www.amazon.com/gp/product/B07GZL1JPV/ref=s9_acsd_newrz_hd_bw_b13uEJ_c_x_w?pf_rd_m=ATVPDKIKX0DER&pf_rd_s=merchandised-search-4&pf_rd_r=76NHWFFWZZD521B1JSSJ&pf_rd_r=76NHWFFWZZD521B1JSSJ&pf_rd_t=101&pf_rd_p=b67dd362-45ca-58fb-bec1-d782c2c03b3b&pf_rd_p=b67dd362-45ca-58fb-bec1-d782c2c03b3b&pf_rd_i=15707471" rel="ugc">https://www.amazon.com/gp/product/B07GZL1JPV/ref=s9_acsd_newrz_hd_bw_b13uEJ_c_x_w?pf_rd_m=ATVPDKIKX0DER&pf_rd_s=merchandised-search-4&pf_rd_r=76NHWFFWZZD521B1JSSJ&pf_rd_r=76NHWFFWZZD521B1JSSJ&pf_rd_t=101&pf_rd_p=b67dd362-45ca-58fb-bec1-d782c2c03b3b&pf_rd_p=b67dd362-45ca-58fb-bec1-d782c2c03b3b&pf_rd_i=15707471</a><br />
<br />
then you can measure the AC input, and DC voltages on the big connector &nbsp;as shown <br />
<a href="https://filedb.experts-exchange.com/incoming/2018/11_w45/1400861/atx.png" target="_blank" title="atx (35 KB)"><img alt="atx" class="file-block lazyload" style="max-width: 236px;" data-src="https://filedb.experts-exchange.com/incoming/2018/11_w45/1400861/atx.png" /></a>
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atx.png

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Hi NOBUS, I'm in Willis, TX. &nbsp;Where are you? &nbsp;I'll drive! &nbsp;:)<br />
Here is the multimeter I have: &nbsp;Greenlee DM-200A Digital Multimeter <br />
So I can attach to any com port (black wire) and then measure each one of the 24 pins? &nbsp;Should it hit the numbers exactly or is there a range? &nbsp;If find any that are out of range, then the PSU is faulty, yes? &nbsp;If not the PSU, and I use only 1 stick RAM, and still no boot POST, then probably mobo? &nbsp;<br />
<br />
If mobo, then I'm going to replace mobo, psu, cpu, RAM... LGA 1151 the best way to go? &nbsp; I was looking at this as a possible build that would be better than what I currently have: &nbsp; <a href="https://www.pcgamer.com/gaming-pc-build-guide/" rel="ugc">https://www.pcgamer.com/gaming-pc-build-guide/</a>
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&gt;&gt; &nbsp;Where are you? &nbsp;I'll drive! &nbsp;:) &nbsp;&lt;&lt;&lt; &nbsp; &nbsp; that would be quite a journey - to Belgium....<br />
&gt;&gt;&nbsp; So I can attach to any com port (black wire) and then measure each one of the 24 pins? &nbsp;&lt;&lt;&lt; &nbsp;right, you can also attach the BLack lead ( -) to the chassis, it should be the same<br />
&gt;&gt;&nbsp; If find any that are out of range, then the PSU is faulty, yes? &nbsp;&lt;&lt; &nbsp;if they differ more than 5% yes, probably (95%) PSU bad<br />
&gt;&gt;&nbsp; I use only 1 stick RAM, and still no boot POST, then probably mobo? &nbsp; &nbsp;&lt;&lt; &nbsp;mobo, or CPU - don't forget to test with other ram stick too.<br />
if still nothing on screen, remove the AC cord and bios battery for 20 sec, and hold power button pressed, then reinstall and test
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don't forget that when testing power supplies ensure that power_good is at 5V
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Hi Folks, Here is the test for the PSU. &nbsp;As far as I can tell, it looks like PSU is ok??<br />
I also bought a mobo test card. &nbsp;Will try that next.<br />
<a href="https://filedb.experts-exchange.com/incoming/2018/11_w46/1401430/CORSAIR-TX650-TEST.jpg" target="_blank" class="file-inline" title="Using test card for PSU (138 KB)"><svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 512 512"><path d="M67.508 468.467c-58.005-58.013-58.016-151.92 0-209.943l225.011-225.04c44.643-44.645 117.279-44.645 161.92 0 44.743 44.749 44.753 117.186 0 161.944l-189.465 189.49c-31.41 31.413-82.518 31.412-113.926.001-31.479-31.482-31.49-82.453 0-113.944L311.51 110.491c4.687-4.687 12.286-4.687 16.972 0l16.967 16.971c4.685 4.686 4.685 12.283 0 16.969L184.983 304.917c-12.724 12.724-12.73 33.328 0 46.058 12.696 12.697 33.356 12.699 46.054-.001l189.465-189.489c25.987-25.989 25.994-68.06.001-94.056-25.931-25.934-68.119-25.932-94.049 0l-225.01 225.039c-39.249 39.252-39.258 102.795-.001 142.057 39.285 39.29 102.885 39.287 142.162-.028A739446.174 739446.174 0 0 1 439.497 238.49c4.686-4.687 12.282-4.684 16.969.004l16.967 16.971c4.685 4.686 4.689 12.279.004 16.965a755654.128 755654.128 0 0 0-195.881 195.996c-58.034 58.092-152.004 58.093-210.048.041z"/></svg>CORSAIR-TX650-TEST.jpg</a>
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CORSAIR-TX650-TEST.jpg

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that's good news - now - the q remains why it won't start at all?<br />
first thing comes to mind is faulty power switch, or loose cabling
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I just put in the PC Analyzer card, all other cards removed except 2 sticks of RAM. &nbsp;Here are the alternating codes that flash: &nbsp;62 &nbsp;00 &nbsp;E8 &nbsp;01.<br />
Does that mean that the CPU has failed?<br />
<a href="https://filedb.experts-exchange.com/incoming/2018/11_w46/1401445/MOBO-TEST-CARD.jpg" target="_blank" class="file-inline" title="MOBO-TEST-CARD.jpg (154 KB)"><svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 512 512"><path d="M67.508 468.467c-58.005-58.013-58.016-151.92 0-209.943l225.011-225.04c44.643-44.645 117.279-44.645 161.92 0 44.743 44.749 44.753 117.186 0 161.944l-189.465 189.49c-31.41 31.413-82.518 31.412-113.926.001-31.479-31.482-31.49-82.453 0-113.944L311.51 110.491c4.687-4.687 12.286-4.687 16.972 0l16.967 16.971c4.685 4.686 4.685 12.283 0 16.969L184.983 304.917c-12.724 12.724-12.73 33.328 0 46.058 12.696 12.697 33.356 12.699 46.054-.001l189.465-189.489c25.987-25.989 25.994-68.06.001-94.056-25.931-25.934-68.119-25.932-94.049 0l-225.01 225.039c-39.249 39.252-39.258 102.795-.001 142.057 39.285 39.29 102.885 39.287 142.162-.028A739446.174 739446.174 0 0 1 439.497 238.49c4.686-4.687 12.282-4.684 16.969.004l16.967 16.971c4.685 4.686 4.689 12.279.004 16.965a755654.128 755654.128 0 0 0-195.881 195.996c-58.034 58.092-152.004 58.093-210.048.041z"/></svg>MOBO-TEST-CARD.jpg</a>
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MOBO-TEST-CARD.jpg

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i dont know the codes of your testcaed, you have to look them up in your manual., or post the model here<br />
if that is the code - remove and reseat the cpu, and renew heatpaste as test<br />
<br />
***and that the voltages are ok, only means that they are present, <b>not that they supply enough power to start the pc; </b>so the end test remains a LOADED power supply test (modern testers apply a certain load)
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Windows will see that as a new computer, looks like all you are keeping is the metal case. There again you can still get away with reusing an old OEM license since you get two goes by default.<br />
<br />
I doubt a PCI-X POST board will give valid results on a PCIe based board, it's the wrong side of a PCIe to PCI-X bridge chip. A bit like testing the temperature of bath water by putting a thermometer on the floor under the bath.
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did you find the meaning of the code?
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<div class="content wysiwyg-content">
Is there a device that I can buy that will diagnose a motherboard? &nbsp;I've done the paperclip test on the PSU, so its ok. &nbsp;I've replaced the cmos battery, reseated everything. &nbsp;PC won't POST, so I need a hardware tool to diagnose why? &nbsp;Ideas?
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Is there a device that I can buy that will diagnose a motherboard?  I've done the paperclip test on the PSU, so its ok.  I've replaced the cmos battery, reseated everything.  PC won't POST, so I need a hardware tool to diagnose why?  Ideas?

Hardware diagnostic tool

A personal computer is a general-purpose computer whose size, capabilities and price make it useful for individuals, and is intended to be operated directly by an end-user with no intervening computer time-sharing models that allowed systems to be used by many people, usually at the same time. Personal computers may be connected to a local area network (LAN), either by a cable or a wireless connection, and through that to the Internet. A personal computer may be a laptop computer or a desktop computer running an operating system such as Windows, Linux or Macintosh OS.

Hardware includes cell phones and other digital living devices, tablets, computers, servers, peripherals and components, printers and scanners, gaming consoles, networking hardware such as routers, hubs, switches and modems, storage devices and security equipment such as firewalls and other appliances.