Occasional Primary Drive 0 not found error

I have a windows XP pc which will occasionally come up with a "Primary drive 0 not found, Primary drive 1 not found" error on boot up.  It will ALWAYS find the hard drives second time around when you use F1 to boot it up.  I have opened it up today and reseated the cables, I've restarted it 5 times but I haven't been able to recreate the error.  I'm just dubious about that actually being the cause seeing as it has never failed to boot a second time - surely if the problem was a loose cable, its behaviour wouldn't be so predictable.  Is there anything else I should try to prevent the issue occurring again?  It is a Dell Optiplex GX270.  Thank you!
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GlobexCorpAsked:
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maduropaConnect With a Mentor Commented:
We've had several GX270's and GX260's and some of them had troubles, also with booting.
Sometimes no problem, and then sometimes problems.
As soon as we opened them there was no problem, but if we closed it, it stopped working.

We let a Dell technician replace the cables, and the problems were solved.
It turned out a little nick had gotten in the cable, and that caused all problems.

maybe you have a similar problem, and a little signal distortion prevents to recognize the hard-disk sometimes?
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CallandorConnect With a Mentor Commented:
Your drives may need more time to spin up before the system recognizes them.  You also may have a power supply problem and can't power up the drives from a cold boot.  Test out you power requirements with the calculator: http://www.jscustompcs.com/power_supply/
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GlobexCorpAuthor Commented:
My power usage is well within what the supply should be able to handle, but it is definitely an idea.  I'm hoping reseating the cables has resolved the issue as it hasn't happened since, but you've both given me very interesting theories to work on if it doesn't.  

Thanks!

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