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I own a Gateway GT5220 AMD Athalon 64 X2 Processor 3800+. When I purchased the computer from Circuit City, I wanted to put a better video card than the onboard nvidia 6150 LE that it came with. The sales guy sold me an ATI Readon X1300 Pro. It worked fine for over a year. At some point it began having a problem. When ever the computer would go into the hibernate state, the ATI card wouldn't fire back up after engaging the mouse or keyboard. The compuer would seem to drop the aftermarket card out of the device manager and go back to using the onboard one. I guess I had just figured that the card was bad. Fast forward to now, for Xmas I received a PNY GeForce 9800 GT. I disabled the onboard and put the new card in, and it began working fine, when I woke up in the morning it was having the same problem that I was having with the ATI Card. I called PNY and they told me that I was a power supply problem, the Gateway came with a 300w power supply. I replaced the power supply with an antec 430w ATX12V v2.2 and put the PNY card back in and it seemed to work fine. Woke up this morning and the screen was still on, but the computer needed to reboot after a virus scan, and upon rebooting it dropped the new card out of device manager and went back to onboard video. (When I say it went back to onboard video, I mean that i had to switch monitor back to plug in for onboard video card, but device manager still shows the card as disabled. BIOS is set for the PCI Express Video card to boot first. Very frustrated at this point...ready to chuck the whole computer out the window!!!!
This sounds like either a location driver error, possibly your two graphics drivers being on the same IRQ address which can be changed in the device manager somewhere.
or which i think is more likely
Dodgy motherboard, it may have the option to prioritise the PCI-E but seems like that doesn't work. Sadly if this is the case there maybe no solving it other than a new MOBO.
I would have said power or the card but you have changed both of those already.
Sometimes there is also a phyiscal switch on the board to change from loading onboard to a PCI-E card. I've seen it in switch and jumper format but this mostly with older boards.
What else you can try is just out right disabling the onboard video in the device manager, forcing it to load the only available option maybe?
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or which i think is more likely
Dodgy motherboard, it may have the option to prioritise the PCI-E but seems like that doesn't work. Sadly if this is the case there maybe no solving it other than a new MOBO.
I would have said power or the card but you have changed both of those already.
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What else you can try is just out right disabling the onboard video in the device manager, forcing it to load the only available option maybe?