everytime i start my pc it crashes after 2miutes no matter what i do, no error message just stops responding then i restart it, it fails to start, then i restart it again its fine ? why is this?

hi, any number of reasons ,HEAT being one ,did you open computer ans check for dust and dirt in all fans
and also make sure all fans are working ,make sure if it has a video card install that its fan is working and clean .
if not dirty then some piece of hardware could be failing or over heating

Power supply may may be the problem too...

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