Internal Hard-disks & DVD Disappear

Sep 22, 2012

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 Windows 7 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.

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I have:
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