Hello Recently I changed my old graphics card (from an Nvidia 6600GT to a ATI HD 4670), I also did the following manipulations to solve a problem I had with my computer (side note: I have WinXP): - Opened my PC case (with power off of course) and check for connections in it, my DVD drive was not correctly connected, fixed it. - On the motherboard there was a battery looking like a watch battery, took it out for 10 secs to restore factory settings on my motherboard. - Went inside the BIOS of my motherboard and stumbled upon the fact that USB 2 was not activated, so I swiitched from USB 1 to USB 2. Now my problem is that when I go to Start> Turn off the computer > Sleep (not sure it's the right word in english, my WinXP is in French). Anyway before when I chose that the computer would go into sleep mode without any problem and that's it. But since I have my new card it doesn't. It seems to (the hard drives etc seems to go to sleep, the screen also finds no signal and also goes to sleep but I still hear a fan running in there with as much noise as when the computer is still running normally, really weird. I was thinking the fan is the new graphics card, I didn't install it, the vendor installed it for me since i'm not really a brain at internal electronics, maybe there is something to connect on it to tell her when to go to sleep, I dunno. Or it's the proc fan. Does anyone have an idea on how to solve this please ? Thanks a lot !