Computer has stopped recognizing second video card. - Hardware & Software

Hello Facepunch, I got a new computer about 1 year ago, it came with 2 GTS 450's, they had the SLI bridge and both cards were being used. Recently I noticed my FPS in games has dropped and I did some investigating to find out why, turns out my computer has stopped recognizing my second card. Here is a few of things I have done recently regarding Software updates. I upgraded my Video card(s) driver twice, it is now up to date on the current version which is 310.9 Here is a list of solutions I have tried so far -Cleared all my old drivers and reinstalled -Checked to see if both of the graphics cards worked in the 1st PCI slot, they both do. -Checked to see if my 2nd PCI slot works, it does not. (Both graphics cards work in the first though) -Switched power sources (No issue) -Checked to make sure my motherboard was capable of running 16x PCI Express, it is. -Removed and switched graphics cards (Still did not recognize the second) -Dusted my entire computer -Checked in the Nivida panel if the SLI option was available, it was not. -Checked in my BIOS if the 16x was enabled, it was. System specifications Intel Core i5 2500 Gigabyte Technology P67A-UD4-B3 (Motherboard) 4 gigs of Ram GTS 450 x2 ACE POWER 800W 80PLUS (Power source) At this point I think it is a motherboard issue and if a solution is not found soon I will take it to a PC specialist and have them fix the problem. But I would rather not spend money.

[QUOTE=foxtrot_iic;39251983] -Checked to see if my 2nd PCI slot works, it does not. (Both graphics cards work in the first though) [/QUOTE] Well there's your problem. If it just suddenly stopped working it sounds like a MOBO problem. You could try cleaning the pci slot with some compressed air. Don't take it to a pc specialist if its going to be over 130$, just get a new mobo. You could also try updating your bios.

How would one update their bios?

Try resetting the BIOS first. Unplug the computer and remove the battery on the motherboard for a few minutes. Put the battery back in after that and plug in and turn on the computer. You might have to set a couple of BIOS options for the machine to be able to boot again, but don't change too much before you test out the second slot again.

[QUOTE=bohb;39252887]Try resetting the BIOS first. Unplug the computer and remove the battery on the motherboard for a few minutes. Put the battery back in after that and plug in and turn on the computer. You might have to set a couple of BIOS options for the machine to be able to boot again, but don't change too much before you test out the second slot again.[/QUOTE] If I recall correctly that's clearing CMOS. And you should read your manual for where to move the jumpers.

[QUOTE=Killervalon;39296201]If I recall correctly that's clearing CMOS. And you should read your manual for where to move the jumpers.[/QUOTE] You can clear the BIOS settings by using my method or by using the jumper. My method is safer, especially if you can't find the clear BIOS jumper. There's also the possibility of turning on the system while the jumper is in place, which can damage the motherboard.