Since the computer operates without problems without the second drive 
and since the second drive comes from a computer that "crashed", the 
hard drive very likely has an electrical and/or mechanical problem. I 
believe this likelihood was mentioned before. It probably has at least 
an electrical short.

If the data on it is really important, you could have it tested to see 
if it can be physically repaired. Once that is done, you may still have 
a problem accessing the data on it and that would require further 
assistance.

 Unless you have some tech friends with test equipment, you are looking 
at some cost(s). It really comes down to a cost/benefit decision.

Good luck.

Tom

ceares wrote:
> The fan was just replaced and the thing is, it works perfectly fine until I add the 2nd hard drive . When that hard drive is removed/unhooked from system, computer operates perfectly. 
>
> The hard drive was taken from another computer that crashed-not sure why-and I just need to get the data off of it. I thought I could add it as a slave drive and do it that way but the minute it's hooked to the computer, there is the shut off problem--it never even gets to boot point, just on-then bloop, off again. 
>
>   
>   

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