I start up my computer and after a minut it just reboot

[nimiel]

Hello,
I have hp550 laptop. It worked for me perfectly. Today, I turned it on and it did start up windows. Everything was normal for about a minute and then computer rebooted. It started up again and than again rebooted. Does anyone know what's the problem?

 

[COLGeek]

These are the classic signs of a heat and/or power problem and could indicate a problem with one of the integrated components (video, audio, etc) on the motherboard.

What, if anything, has changed since this problem started? Also, is the system still under warranty?