9800GT GPU Suddenly not recognized.

Hi There,

So recently my 9800GT is randomly no longer recognized. I have been using it for over two year with no recent changes. Now my old Radeon 3450HD is recognized in the same PCI-e slot, also the card works in another system ( took it to a pc repair shop and they tested it.)

System Specs
Mobo- AsRock K10n78m Pro
PSU - Rosewill 650W
GPU- Gigabyte 9800GT
CPU- AMD Phenom II X3 720 Black Edition
RAM- 4GB Kingston DDR2 400mhz

Things I have tried.

CMOS reset
BIOS Update - No update available.
Different card in pci-e slot - card is recognized. (This card does not require supplemental power)
Tried different 6pin connectors for power - no change
Tried 9800gt in a different system and it works fine

I am at a loss here and have no idea what to do next, I was almost certain the card must have been fried but now that I know it is not the card I have no idea where to go next.

Thanks in advance.
11 answers Last reply Best Answer
More about 9800gt gpu suddenly recognized
  1. how old is your power supply?
  2. I ordered it on may 20th 2009. Exact model - Rosewill Green Series RG630-2 630W Continuous @40°C,80 PLUS Certified,ATX12V v2.3,SLI Ready,CrossFire Ready,Active PFC"Compatible with Core i7, i5" Power Supply
  3. That being said, power ratings in the BIOS for the 12v rail read 12.43, so it is providing power. Maybe i should test the voltage at the actual connection point?
  4. Best answer
    Well does it work when you use the integrated graphics? because if the integrated graphics work and if you have already taken it to someone and had them test it in another system. I would guess it would be your power supply starting to fail at certain things like providing power to the 12v rail for your video card. the average lifespan of a power supply is about 5 years, that is the suggested upgrade time from most companies. you can buy or use a tester for your pci power connector but I really don't find those to be accurate at all. So what I would try is using a molex to pci connector for your video card, or cleaning out your whole system of dust which can cause weird things to happen over time. I would probably just buy another power supply. You could also consider this being a good time to think up some upgrades for your system. Like maybe a new am3+ motherboard, A new video card, new ddr3 ram, a new fx 6xxx or 8xxx cpu, getting an ssd. what I wold do is overkill your power supply, Say you want a new gtx 760 or the new radeon series. try to make sure you buy a power supply good enough for those.
  5. Yea you are totally correct, the onboard works. My thoughts were to try and get a bit more life out of this system, but you are right I should probably just buy a new one. I will try the molext-pci-e and a good clean and let you know how it goes.
  6. So I tried every possible power connection and gave the system a good clean, nothing. Everything runs fine without card. I noticed by coprocessor isn't installed in device manager. I do not even know what this is, could this be affecting in anyway? I am really lookin to fix this as I cannot afford a new system currently.
  7. No you don't need it, What would be your budget for a new power supply would $50 be to expensive?
  8. I could probably afford a decent power supply, if I get one I would want it to transfer into a new system with ease when the time comes. So probably between 100-200. It would suck to buy a psu and it not be the problem, however it is the only thing that makes sense anymore. I guess if i could find a different card that is equally as power hungry to test then i would know for sure.
  9. then I would just ask your friends and that to find one, you can always send the power supply back if it doesn't still work
  10. Ordered a Corsair HX750 and now everything works fine. Thanks for all the help.
  11. No problem, glad everything worked out for you.
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