Hello all,
I tried INSTALLING some new ram TONIGHT and when I hooked everything back up and turned it on, I get a message "disk drive failure" and it asks for a boot disk. I tried putting the old ram back in and got the same. It doesn't seem to be recognizing the HARD drives, at least not consistantly. Sometimes I can get it to show up in the bios, other times it doesn't. Everything was working fine prior.  I obviously messed something up, even though I was quite careful.  and now I'm really kickinG myself for not backing up everything before ( what I thought was going to be a simple task). Any ideas what went wrong?  We would guess that you pulled a cable out of a a connector.
Not surprisingly, that thought did occur to me. I have checked over the cables NUMEROUS times and Everything seems to be plugged in as it should be. It still may be a cable problem. Both SATA and IDE cables are delicate. Even the power cable going to the drive can fail with no risible sign. Happens to me all the time.
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Perhaps you also RESET the CMOS while in there.The BIOS is trying to boot the wrong drive.Check you BIOS.