Very Peculiar System Hangs When Lid Is Closed

Recently, with no system changes, suspicious downloads, or drops in recent history, my 6 Month old Clevo build began exhibiting two very bizarre symptoms:

1) Upon booting, Windows will start normally ,up until the mouse is rendered before the log in screen appears, then the system seems to power down. However, upon pressing the power button, the computer resumes booting right from where it left off as if it had entered a very rapid hibernation mode.

2) When the lid is closed during normal use, even when the system is not set to sleep or hibernate upon a lid closing, the system will hang permanently, with indicator lights like caps lock getting stuck either on or off and the hard drive light not turning on. This requires a hard reset to fix.

I have scanned memory, boot sectors, and the entire hard drive for malicious programs like worms, packers, and rootkits with Avast and Kapersky boot time scans to no avail.The system behaves normally otherwise, except during boot or lid closing. No overheating, screen flashing, or abnormal system processes are occurring. Though I have not yet checked the exact temps or checked the contents of rundll.I have a hunch it is the motherboard, but I don't have the screwdrivers to check or try to reset the SODIMMS.I have found a few questionable errors in the event log, but no strange processes in system resource manager.This is transcript of said questionable error log with all events from past 7 days (as of 11/27/2011) (with said issue arising on the 25th)The Download is 215 Kb compressed and 5 Mb uncompressed with over 7,000 events.On an unrelated note, the event log reports the processor getting underpowered, is this just a momentary thing during bootup or something that could hinder performance?