My PC used to work fine but then exhibited various problems and now does not detect my second graphics card. Any single graphics card in any slot will be detected. If both are in then only the top / primary one will be detected.
The Gfx card fans will always spin up. If the EVGA card is in the second slot while the MSI is in the first then the EVGA fan will spin very loudly.
Before the current problem my PC started crashing randomly. This included BSODs but also the PC stuttering and then freezing. My Gfx cards were not overheating and my PC has been cleaned of fluff and dust.
I'm fairly sure the freezes and BSODs started after I updated to nVidia's 320.18 driver, which possibly conflicted with factory overclocked cards like mine.
I rolled back to 314.07 but the problems continued. Currently I'm running 320.49.
Microsoft Windows 7 Ultimate 64-bit CPU
Intel Core i7 920 @ 2.67GHz 40 °C
Bloomfield 45nm Technology RAM
6.00GB Single-Channel DDR3 @ 534MHz (8-8-8-20) Motherboard
Manufacturer ASUSTeK Computer INC.
Model Rampage II GENE (LGA1366)
Chipset Vendor Intel
Chipset Model X58
Chipset Revision 12
Southbridge Vendor Intel
Southbridge Model 82801JR (ICH10R)
Southbridge Revision 00
System Temperature 29 °C BIOS
Brand American Megatrends Inc.
Date 2009/04/09 Graphics
EVGA GTX460 SC
MSI N460GTX cyclone igd5 OC EDIT: PSU
Vantec iON2+ 600W
Can you tell us what brand of power supply you are using and how many watts it is rated at. And what model number of graphics card`s
And how long you have had your power supply.
Psu`s degrade over the time they are in use and become less stable.
Often blue screens, unexplained shut down`s and hardware not being detected can be a cause of the PSU in the system failing.
Most likely the power supply is the problem.
I would suggest a 750watt unit for dual 460's. This would run the power supply in the 70 to 80% range of its rated capacity.
Alway buy quality units ,such as SeaSonic, XFX, Corsair.
Power supply list. Always choose Tier 3 or above for a good stable unit. http://www.eggxpert.com/forums/thread/323050.aspx
It looks like the cards function according to which power cables are being used after all, and not what slot they are fitted in. I'm going to look into getting a new PSU. If that solves the problem then I'll update the thread