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Is the motherboard gone?

I hava an HP A320N with an AMD 2800+ processor and 512 mg of Ram.    When you turn it on the blue light around the buttton liights, the keyboard lisghts flash for a moment and the fans turn for a couple seconds.  The the fans shutdown and there is not even a post beep.   The blue light around the buttton stays lit.   I changed processors, and power supplies but still the same results.   I disconnected all the drives and still th same thing...not even a beep.   Any idea?
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syssolut
Asked:
syssolut
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4 Solutions
 
DPAITCommented:
Generally this means that the Powersupply is getting a power not good signal and shutting down.  This can be a short on the system, but generally its a CPU that has gone bad.  Not the motherboard usually.
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garycaseCommented:
This can be caused by bad memory; a bad CPU; a bad power supply; or a failed motherboard.  You've somewhat eliminated the CPU and power supply (assuming the replacements you tried were "known good" ==> and that you plugged all of the power connections in correctly with the new power supply [both the ATX power connector and the auxiliary power connector].

As for the motherboard, inspect it very carefully for any signs of bulging or leaking capacitors.   I'd unplug and reseat the the memory modules.

If there are no obviously bad capacitors and reseating the memory doesn't work, then remove the motherboard from the case; and see if the system boots to the BIOS in "barebones" mode ... just the motherboard, CPU, video card, and one memory module.   If that works, then connect a floppy or CD drive and see if it will boot to a bootable floppy or CD.



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CiTech05Commented:
In addition:
If you need to troubleshoot the barebones, I would unplug anything and everything from the board not needed and TS each component as its added.
In other words, start with the basics and start adding cards checking to see if you can get it to post or beep. Start with no memory plugged in (most will beep at you like there is no tomorrow) and no VGA card if you do not have on board video most will also beep if you do not have on board video. If you have onboard video this will just help the TS procedure.

I see this issue a lot and about 50% of the time, its a broken trace on the mobo (the systems I work on are often made mobile and get banged around alot, just saying it may be a possibility). You won't be able to see a broken trace as most of them run in the layers of the PCB. After sending multiple boards back to the supplier, they finally notified us that it was due to too much pressure from securing various components that broke these traces, specifically under the PCI, AGP, CPU and overtightened mobo screws that smash and break traces running close to screw holes.

When the PSU consistently shuts down right away, its recognizing a short somewhere. Sometimes I also see this being a problem with add-in cards, gradually adding cards to see if you can get a different response will help single this out as well.

A simple $7 PSU tester would have eliminated the PSU as the problem without needing to replace it.
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syssolutAuthor Commented:
Two things I failed to mention.    When you plug the power Supply in the fans turn on for the 2 seconds and shutoff, but the blue light around the power button stays on.   If you hold the power button in for 10 @10 secs, the blue light around the power button goes off just as if you were doing a hard shutoff.
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syssolutAuthor Commented:
I pulled out the notherboard and had it connected just via the power supply.   I pulled teh memory, all teh cards and the cables except the power switch and all I got was the fans start for two secs and turn off and the blue light around the power switch stays on just like before.
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garycaseCommented:
You did mention the blue light stayed on in your original question :-)

You need to leave one memory module inserted when you test the "bare bones" boot.   Did you do that? (... you said "... I pulled the memory ..." => just want to confirm you put one module back before trying the boot)

Assuming you did have a memory module installed; it definitely points to either a bad motherboard or a bad CPU.   Since you've tried another CPU, that pretty much confirms it's time for a new motherboard.   Did you try this outside of the case (just to confirm you don't have a short to the case) ??

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CiTech05Commented:
http://hardware.mcse.ms/archive12-2005-9-239326.html

Sounds like your not the only one with the issue.
The concensus looks to be a mobo issue.

Unfortunately a Socket A board is not too easy to come by (not many computer stores carry them) but some are still available online.
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garycaseCommented:
As I noted earlier, be sure and check the motherboard for failing capacitors (leaking or bulging).   This is a frequent cause of failed motherboards ... and if you don't want to get a new system, the motherboard can be economically repaired ==> which avoids the need to buy a new CPU & memory; reload the entire system; etc.    If that's the case here, a good place to have the board repaired is http://www.badcaps.net/
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syssolutAuthor Commented:
I have checked the capacitors....None look like they are leaking or bulging.   I shorted the CMOS but it still the same results.
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MoatazGadCommented:
Try flashing the BIOS with a valid BIOS image using a flashing device or through a hot flashing procedure.

Moataz
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syssolutAuthor Commented:
Can I flash the BIOS if I don't even get a post beep?
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MoatazGadCommented:
There's a small chance to flash the BIOS when you don't get a POST beep. This could be done using UNIFLASH bootable diskette. Check the UNIFLASH user manual for instructions about that. http://uniflash.org
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syssolutAuthor Commented:
The owner of the computer said to stop trying and they are going to get a new system.   Thanks for all your input.
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