Apple iMac A1311 "Core 2 Duo" 3.06 21.5-Inch FOR PARTS ONLY

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Up for sale is my 2009 iMac for PARTS ONLY. I purchased the iMac new and have used it until a few years ago when it was no longer needed.  I recently reformatted the computer in order to sell it and now it has a hardware problem.  When I start the computer the log in screen shows and simultaneously the fan begins to run.  I am able to log in and use an application for a few moments but then the screen goes black and fan turns off.  A few minutes later the computer is back on but the fan begins to run and the same process occurs.

I do not know what the problem is and am unable to run hardware diagnostics therefore the computer is parts only. 

Price is firm and it is availble WITHOUT mouse or keyboard for pick up in Alkmaar.