i just bought a case with 450 Watt Power supply. I installed a new P4 2.4 GHz/533 FSB on to my new motherboard: ECS L4S8A2. I'm also running 512 MB PC2700 DDR. It boots to the bios and i can see my 80 GB WD hard drive and cd rom. then it just hangs and eventually says "boot system disk not detected...". i've tried every bios setting imaginable. I even tried booting up the XP install CD, but it says that the windows xp setup couldn't detect my HD. I know my HD is fine because i put it back in my old AMD machine and it boots up fine. any bios suggestions? Could it be bad mobo or ram? help!

Could be a bad IDE controller I suppose but this is fairly unlikely with todays quality control.....make sure the IDE cable is in the right way round........try making the hard drive slave if the IDE cable is the right way round. See if the system will boot of a DOS boot disk.

Also try changing the FSB to 100 MHz.

ok, heres an update:
I figured out there's absolutely nothing wrong with my new system. it's my WD hd. i took another PC hard drive w/ win 2000(seagate) and it booted up fast and no problems. So i powered down and stuck my WD as a slave and it wouldn't boot up at all. It gets stuck at the bios for a bit, then it finally detects it (after 2-3 min), then the system gives error that no boot system disk installed, etc. if it's just a slave, then how could it interfere with the boot process?? so i thought maybe this p4 system just doesn't like my WD. so i stuck it as a slave and the seagate as master in the other machine and now that machine won't boot up. in fact it won't detect it at all. I know it's not crashed because if i stick it my 3rd machine, it boots up fine. so i thought maybe it because of XP. so i formatted and it still won't detect it at all. i have 2 partitions, the c is fat32 and d is ntfs. could that cause it?

thanks