Hi Friends I have the following h/w configuration. And my PC was working fine till now. Recently I have upgraded my motherboard AMI BIOS to its latest version (1011) and then accepted the default setting of the BIOS. Unfortunately before flashing the BIOS, I had not note down/backed up the different settings, set by the dealer at Nehru Palace, New Delhi. 1. ASUS K8N motherboard (Socket 754) 2. AMD Athlon 64 2800+ 3. MSI T128 (nVidia GeForce FX 5200) AGP graphics card 4. Kingston 512 MB DDR1 RAM 5. 320 GB Seagate ATA HDD Now, after BIOS upgrade with its default settings, my PC is booting up normally. But whenever I'm trying to run any moderate application like IE, Firefox, VLCPlayer, etc ... my PC goes into HARD FREEZE mode/hangs permanently. And then neither the mouse, nor the keyboard works which then needs hard boot by resetting the power button Note that, this behaviour is across the OSes like WinXP SP3, Ubuntu 9.04, etc .... hence I thing there is something wrong at root/BIOS level. I have all the latest drivers for my components but still living with this problem. Again, when I'm uninstalling the graphics driver, the PC works well without hang but the display is toooooooo slow. So again, I thing there is something wrong in BIOS and graphics card settings combination. I have also disabled FASTWRITE/AGP side bus, but still no result. Please help me.