System will not boot—black screen System: Cpu Pentium D 3.2 GHz Motherboard GA 945PL-S3 Memory DDR2 667 1GB generic HDD Seagate 250 G SATA DVD Pioneer 112D Video card Diamond Stealth64 2001 series using PCI slot Shaw case with power supply unit rating 550W---bad choice I know…. If anyone can help. Trying to put a system together. Initially the computer will boot to BIOS screen awaiting installation of OS. However on the 3rd or 4th boot there was a continuous short beeps which I stupidly ignored but it stopped on rebooting. I started the winXP installation and at the end of the hard disc formatting the screen just went black. I have not had anything on screen since. On rebooting with the above configuration , there is no beep sound or anything on screen. I do not even get the BIOS screen. The cpu fan fires up and I can hear an occasional clicking on the working of the hard disc drive. On booting with just bare system ie CPU and motherboard ( No memory, HDD , DVD or video card) the long continuous short beeps returns. Is this normal???? The Gigabyte hand book states this type of beep means “power error”. But would you expect this type of beeping with just the bare system anyway?? I have cleared CMOS both by taking out the motherboard battery for 30minutes and also put a jumper across the “clear cmos” pins. You might wonder why I am using such an old video card. I thought I can get the system up and running then save for a more contemporary card. I have a gut feeling I have fried either the motherboard or the cpu or both but cannot work out which . I blame it all to my poor choice of power supply ie the Shaw case. The fact that the system beeps when booted bare (cpu and motherboard) suggest to me that the motherboard is still intact?? Is this a correct assumption?? If anyone can help it would be much appreciated.