Random startup freezes?

it's random too.changed cpu fan.. to stock intel heatsink running at stock speed. freezes up on boots... first time it boot ok 2nd no ,, after a while 3rd it booted.. before i couldn't boot at all but now that i replaced the heatsink it's boots randomly which is still better than before . what could be causing this ... i know it's the cpu but is it defective??? it failed the burnin test (dos)before i changed the fan. If i gett it to boot into windows i do a stress test it doesn't even die. (well i did it for like 1/2 an hour..) peaked at62 with core temp.. still.... in bios before it said it was 47-50 C even so it should still boot.. is it the motherboard??? how do i test the motherboard if it is?? i know how to test everything else but this....

da whole system is like it's like 3 months old

and it's not memory , hd, or graphics card. I did a test on all those except for graphics but if it's graphics it should just blue screen not freezewhat i mean by freeze is it goes fast then slowRandom startup freezes?okay, try the simple stuff first. You may have too much thermal paste, or too little, or a crappy brand. You want a brand that is not electically transferable. 62 core temp is hot. Clean off thermal paste and apply a new layer. Wafer thin. Google techniques.Random startup freezes?The way you test a motherboard is to swap the motherboard and see if the problem goes away. What kind of thermal medium did you use between the CPU and heat sink? I like Arctic Silver, but it is more important to get the surfaces clean and spread it ridiculously thinly than it is to use a certain brand.



http://www.arcticsilver.com/arctic_silve

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