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Computer boots but no display

please help this computer is a new build.

Built computer with athlon dual core 64...and sata2 hdd, and 2x dvdrw and sapphire 850 graphics cards on pci-e slot....also is 2gb of ram....the computer was working and windows is installed but now when i switch the pc on the video card fan comes on the psu works correctly and the heatsink is running but still no display but you can hear the monitor switch when the pc boots but no display...just no signal message...what can it be? thanks guys and girls..
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rains_kars
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rains_kars
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1 Solution
 
burrcmCommented:
Check the video card is properly seated. Check no bent pins in monitor cable. Try another video card.

Chris B
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rains_karsAuthor Commented:
Hi Chris thanks for helpiong i will try that solution later...i awalys forget about bent pins...i am nearly certain the card is seated correctly because the clip at back clicks out to tell me that and the fan comes on the graphics card...can the bios create this problem...?
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burrcmCommented:
BIOS - unlikely - if video is working you should see post screen. Can't hurt to clear CMOS though. You say it is booting, but is it really I wonder. If it is you should get a beep or two and after a while (assuming XP) one quick press of the power button should cause it to shutdown. If all this isn't happening, then maybe it isn't really running at all - just the fans. Does it have the extra 4 pin power plug near the CPU? Make sure this is seated properly. Remove the RAM or the video card and start it. If it is booting, it should beep enthusiastically to complain about the missing components. If no obvious activity, I would next try a different power supply.

Chris B
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rains_karsAuthor Commented:
while the pc doesnt shut down when i press the button once....i have to hold it in...and there is no bleeps....(does my mobo support bleeps? http://www.ebuyer.co.uk/UK/product/102598

cheers once again...
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burrcmCommented:
If it has a system speaker, it will beep - if the motherboard is powering up. Holding the power button forces the power supply to power off, the one touch will cause XP to shut down. It doesn't sound like it is running normally. I would try a different power supply. I suspect the 5v output is dead.

Chris B
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rains_karsAuthor Commented:
the psu is a good one £100...i wouldnt hope it would be that....even if the fans r on and hdd is running....could it still be the psu... what else could it be then...and i will check when i get home later.....
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texasguyCommented:
With all you have done and no post beep this should pin point the problem.first check to make sure all the case switch wires are all still attached to the board. (Had it happen to me when I spent so much time digging around in the case and got one caught in something and didnt notice it came loose) Turn of your computer and unplug the power cord to the power supply. then hold down the power button on the case to fully discharge the board. Remove the power cables to the optical drives, the hard drives and the floppy and tape backup if you have them. remove any addon cards inside the case except the video card. Then remove the system memory. Plug the power supply back in and press the power button. If you dont get a series on beeps from the system speaker at this point either the MOBO or the processor has crossed over to the Land of Junk.  Usually its the MOBO. Hope this helps !!!
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texasguyCommented:
And addemdum to the case switches. If this computer has never booted check the website of the manufactuter that made the motherboard. The diagrams of what goes where in the case switch setup in the users manual can have printing errors. Could be the power switch from the case is just on the wrong pins.
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texasguyCommented:

AMD processors are legendary for not initializing without a proper amount of thermal paste during install

If you dont have a lot of experience installing CPU's  check out this link

 http://www.amd.com/us-en/assets/content_type/DownloadableAssets/01-English-K8-CPU-Install-HighRes.wmv.

And make sure you are using high quality processor thermal paste. I have used Artic Silver for years.

http://www.newegg.com/Product/Product.asp?Item=N82E16835100005
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rains_karsAuthor Commented:
okay so try some of the ideas last nite and this is what i have acheived so far:

I stripped down the pc to the bear essentials processor no ram no graphics no hdd or dvdrw.....when i booted the fans came on and nothing i then tried the psu in another machine and it booted the pc...so psu isnt faulty....i tried an old pci graphics card on the new mobo but nothing...(cant test new graphics in old machine because i dont have an pci-e slot (and new machine doesnt have a agp slot) i tried different ram but nothing....i tried some thermal paste on processor and reseated it.....but still nothing...(would it be the processor or mobo?) old i also reseated the mobo incase it was grounding somewhere....but alas no it was fine.....i cant even test the processor because its a 64 bit dual core....so identify the mobo as the issue...what u think guys/girls?  thanks once again...
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burrcmCommented:
One last thing to try before taking the board and CPU back to the supplier for testing would be to clear the BIOS. Manual will supply details. Usually set a jumper briefly then replace it.

Chris B
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rains_karsAuthor Commented:
hey mate tried that last nite shorting the pins and removing cmos for around 2 hrs....no joy....btw i have to mail return these items so which one do you think is faulty processor or mobo...btw again thanks chris for ur prompt reponses....
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burrcmCommented:
It's a 50/50 thing. Mobo is easier to damage physically, but there is no certainty either way. Leave the CPU plugged into the mobo so pins don't get damaged and send them back together.

Good luck

Chris B
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rains_karsAuthor Commented:
can a mobo be faulty without burn marks on the bottom...?...and why would the fans come on for the heatsink fan which is connected to the board...if the board is faulty?
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burrcmCommented:
Q1. Yes. Q2. Fans running indicate 12v getting through. A track not making contact or any component open circuit can stop the rest. This is common. A CPU can also die for no obvious reason.

Chris B
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