Hello, Ive just got a evga 8800 gts sc 640mb and I put it in my pc, firmly screwed down, started the pc up and all I got was a high pitched tone. I couldnt tell where it was coming from but its obviously an incompatibility issue. I just wanted some advice really on my options, the manual says you may need to download the latest agp drivers for youre mobo but I cant find them. Here's my system spec. Pentium 4 550 3.4ghz 2gb ddr ram 250gb hd ms 7046 mobo 350w PSU Operating System Microsoft Windows XP Home Edition OS Service Pack Service Pack 2 DirectX 4.09.00.0904 (DirectX 9.0c) Motherboard CPU Type Intel Pentium 4 550, 3400 MHz (17 x 200) Motherboard Name MSI MS-7046 Motherboard Chipset Intel Grantsdale i915P System Memory 2048 MB (PC3200 DDR SDRAM) BIOS Type Award (11/25/04) Communication Port Communications Port (COM1) Communication Port ECP Printer Port (LPT1) Display Video Adapter NVIDIA GeForce 6600 (256 MB) 3D Accelerator nVIDIA GeForce 6600 PCI-E Monitor Plug and Play Monitor [NoDB] (FGXJ4B0059078) Thanks for any help you can give.