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I saw your posting and would like to try and help.
Lets first check and make sure that under "Services" in Administrator Tools, does the "power" show as 'Automatic' on it's setting?
Also, I would like you to do a test for me below and let me know the results:
Restart or power up the system, if off, and just has soon as you see anything on the screen, start tapping rapidly, 4 or 5 times, the F8 key. Your going to think about just holding it down altogether, but this will cause an error, so please do not do so. Tap rapidly.
We are looking for a menu on the screen that says, "Windows Startup Menu". If you do make it there, then you will use the down arrow key and move down to "Safe Mode" and then tap Enter.
It will eventually get to asking a yes and no question about Safe Mode. Answer yes. Now you will go to your desktop, or if you usually have to log in, then it will ask you to do so.
Note also that not everything functions in this mode, and / or may look different. This is ok and normal.
Now when at the desktop, lets see if the unit still does it's rebooting in this mode. if this does not reboot on it's own, then after you judge enough time has passed, do a reboot and the unit will go back to normal mode.
Be sure to let me know the results on this and thank you.