05-09-2012 10:15 AM
Please find the weblink given below might help you to resolve your issue. Please reseat the Memory on your unit and have it checked incase you have 2 Memory card try with 1 card first to check.
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05-09-2012 01:28 PM
This is a very well known problem which usually may be solved by reflowing GPU (graphic chip).
Many informations about it you will find here.
I recommend you especially post number 9 which is written by CherylG.