I recently bought a computer, in december last year Dell Intel(R) Xeon(R) CPU 5130 @2.00GHz 2.00 GHz, 3GB of RAM Running on Windows XP professional and with an ASUS EAH4350 silent 1GB graphics card and yes all drivers are installed and up to date The problem i have is that when i turn my computer on it says no devices found and that AHCI BIOS is not installed, and when i am on my computer (mostly when playing games) my screen (which is an Akura 19" LCD TV/DVD combi) goes to blue screen and says 'no signal' and any music that was playing becomes a loud repeated thumping like when a cd gets stuck. The only option i have is to turn the computer off via the on/off button by holding it in until it turns off. After this my computer wont restart for 2-3 tries and instead when i press the on button a small 4 lights up on the front and it makes a 3 second buzzing noise repeated with a second inbetween and does not load up, so i have to turn it off via the button. Any ideas whats wrong? and what does AHCI BIOS not installed actually mean?