internal harddisks & dvd disappear

hey, im new here so feel free to tell me if im doing wrong. my problem is that sometimes when i turn on my computer i only have 1 dvd drive( i have 2 installed+3 other internal harddrives), and my primary disc that i have my os on. this does not happen when i use another harddrive with same os on, so i think it have to be driver sort of problem. they have never disappeared in bios, only in win7 on 1 of the discs with os. does anybody know a fix for this? i really dont want to reinstall/wipe my disc. and i have both checked the cables an even switched them to new ones, still showing in bios but not in os. if it were only 1 drive i might consider it dying, but when it's 3 drives witch all pass chkdsk+dvd drive it must be something else? this is a almost new selfbuild pc so i know everything inside is OK. please help me. thanks =/

it could be, but why does this happen only when i use one of the discs with os, and not when i use the other one?i will try that calc soon, and see :) thanks for the answer

yep, it recommend min 520, and i got a 650. so it must be something else =)

bobafetthotmail said:

hmm, maybe the PSU isn't enough.

If you haven't done it already before buying/assembling your rig, insert your specs in this to know how much power it really needs to run.

should i quote or comment? i try both sorry

no one?