something went wrong and window no work only blank screen . for trouble shoot i used ubantu cd
i tried installing virtual box and then win 8
but some trouble with botting up and screen issue
again ubantu cd and again window 7
after several struggles i realized that
1. Mode not supported err is err caused by monitor when hardware unable to understand the signal send by the motherboard and has got nothing to do with the "default monitor/display setting at boot time".
2 the point i realize that it is a hardware problem and not a software problem i decided to give windows 8 another try