I have a customer who built himself a computer and went for an SLI setup (two Nvidia graphics cards). The system is at least a year old (two or three I guess) and it looks like the hard disk has a problem as the machine has started to BSOD on boot every time (0x0000007B INACCESSIBLE_BOOT_DEVICE). I've tried chkdsk /p but it didn't help. I intend to take the hard disk out and test it on my computer to see if it definitely has a problem.

Assuming that the hard disk has a problem and needs replacing, I have a question. Do I need to disconnect one graphics card or anything like that to install Windows XP, or can it be left connected, then SLI enabled after the nvidia drivers have been installed?

I've admitted to the customer already that I've never built an SLI system or used liquid cooling, but it looks like the customer bit off more than they could chew by going for SLI and liquid-cooling at the same time, even though they've never built a computer before. I've said that I won't touch the liquid-cooling system and if I feel there could be a problem that involves messing with it to investigate that I think it's best for me to leave it alone.

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My PC spec

No you dont need to do anything with the 2 cards.

The basic windows drivers will only pick up the main card and once you install the Nvidia driver is when you can ebable SLI.

SLI is not complicated these days, its pretty easy to work with. You dont even need to reboot to turn the secondary card on or off like in the "old" days.

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"All civilizations become either spacefaring or extinct." -- Carl Sagan