Try starting in the Safe Mode; you can access a short menu using either F5 or F8 during the first few seconds after power on.
That will load very little of Windows and you can troubleshoot from there.
You might first try booting again and recording the last lines of text as this may also be a clue to the problem.
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I have a similar problem. My m45-s269 at power up will reset approximately in 2 seconds. It has become a solid failure. Removing a memory simm, wireless card, hard disk drive have no effect on the reset condition. Plugging the external monitor in does not allow a boot to occur either, although some user have had some success getting their machines working. I am beginning to think that this could be a hardware issue. I believe the reset circuit has degraded, to the point it detects a reset condition that does not exist. At any point I can't get the machine apart enough to try and investigate the problem fully.
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