dear sir, my laptop is hp 520 with celeron m processor ,everything was working rightly but it used to get stuck up when i used to switch it on.....i had to switch it off and start it many times ....but yesterday same thing happened and now nothing is coming .i thought if i format my system it wud become proper again so i put the windows xp bootable cd it started but it is saying hard disk is not installed please help me sir,nothing even the safe mode is opening...it goes on restarting again and again please help me
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