IBM x306 server cannot restart ???

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http://www.linuxquestions.org – i have a problem with IBM server x306 (onboard) RAID 1 SATA HD machine. can any one advise me please, i noticed that each time i start and run this machine for up to 30mins or so, from that point on, if i do a restart (lets say after update) it simply never restart immediately but automatically turns itself off - right after POST screen. i have to wait up to 20 or 30min before i can be able to restart this machine. personally i'm suspecting high CPU temperature or something.... but all the fans are in perfect condition! room temperature also fine! but what actually could be the problem here (HowTos)