I've Compaq Desktop Computer Model= Compaq EVO D500
it has windows xp installed with service pack 3. problem is that sometime sytem works fine but sometime all of sudden it get hang and hard drive and cd-rom disappear from bios. even bios does not reset only hard drive and cd-rom skip from it. then I keep the system turn off for some time then turn on and it detect hard drive again and works fine. please help me to resolve this problem.
Thanks Maziar! I've checked the cable and connections all are plugged properly. I've also checked it by replacing cables. Though I am not expert of computer, is there any possibility with bios which does not retain hard disk and cd-rom entries in bios.may be its need to be updated in current version. but I don't know how to do it if this is the case.please help me out!