computer freezes with blank screen

Lenovo Lenovo 3000 n100 notebook
October 6, 2010 at 10:37:03
Specs: Windows XP & ubuntu, 1.86 centrino duo , 1.5GB RAM
I have a lenovo n100 3000 centrino duo laptop. I have both windows xp and ubuntu installed. My computer hangs at he very start (before even the "lenovo" page appears i.e BIOS option). i try to restart my computer a number of times and after about 7- 10 tries the system starts normally although my sound card does not respond. It happened overnight i never downloaded anything suspicious( unhealthy torrent, unknown software etc). i think my hard disk is fine( de fragmented). I suspect it's a RAM problem and i have already tried memtest86. what should i do now??

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October 6, 2010 at 11:04:38
IF you can, I'd test your hardware with PC Doctor 1st:

Just another stupid saying...

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