645 Combo not starting up properly!

Hey, I'm experiencing a really weird thing here, and it's driving me crazy. It seems to be working perfect when I start up, I can log in to XP and everything - BUT.. when the computer has been turned off for a little bit and I start it up again, the monitor never comes on, leaving it all black, and seconds later the computer restarts by itself, only to come back to the black screen.. and round and round we go! What's going on?
And if I restart it from there, it works again!! Maybe there's a loose connection somewhere? CMOS is cleared and everything...
Some specs: Pentium 4 2,2ghz / Kingston PC2700 256 mb ram / 60 gig Hitatchi HD but I don't think it has anything to do with that - I can switch to other hard drives and still experience this!
The one who helps me solve this can pick any ice cream flavor - it's on me!

alright, I have tried the following so far:
- Switched processor (to another identical one)
- Changed the disk to another one with just XP freshly installed
- Swapped current memory to another empty slot
- Tried another identical memory
- Tried yet another, but SDRAM instead of DDR
- Increased RAM voltage to what you suggested, NavJoe
- Tried running on another graphics card
- Disabled the CDRW-drive and floppy drive as well
- Switched to another PSU (also 300W)
And none of the above made any difference - The problem is still there  ;(
But isn't it unlikely that I would need a different PSU, given that most P4 machines uses 300w today, and this is not an extreme machine in any way? Just a thought...
Again, thanks for you time!

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    Sep 14 14:55:46 prime com.apple.emailrules[1403]: 2012-09-14 14:55:46-0400 [-] Starting factory <twisted.web2.channel.http.HTTPFactory instance at 0x10623c7e8>
    Sep 14 14:55:46 prime com.apple.wikid[1400]: Traceback (most recent call last):
    Sep 14 14:55:46 prime com.apple.wikid[1400]:   File "/usr/share/caldavd/bin/twistd", line 19, in <module>
    Sep 14 14:55:46 prime com.apple.wikid[1400]:     run()
    Sep 14 14:55:46 prime com.apple.wikid[1400]:   File "/usr/share/caldavd/lib/python/twisted/scripts/twistd.py", line 27, in run
    Sep 14 14:55:46 prime com.apple.wikid[1400]:     app.run(runApp, ServerOptions)
    Sep 14 14:55:46 prime com.apple.wikid[1400]:   File "/usr/share/caldavd/lib/python/twisted/application/app.py", line 694, in run
    Sep 14 14:55:46 prime com.apple.wikid[1400]:     runApp(config)
    Sep 14 14:55:46 prime com.apple.wikid[1400]:   File "/usr/share/caldavd/lib/python/twisted/scripts/twistd.py", line 23, in runApp
    Sep 14 14:55:46 prime com.apple.wikid[1400]:     _SomeApplicationRunner(config).run()
    Sep 14 14:55:46 prime com.apple.wikid[1400]:   File "/usr/share/caldavd/lib/python/twisted/application/app.py", line 423, in run
    Sep 14 14:55:46 prime com.apple.wikid[1400]:     self.logger.start(None)
    Sep 14 14:55:46 prime com.apple.wikid[1400]:   File "/usr/share/caldavd/lib/python/twisted/application/app.py", line 251, in start
    Sep 14 14:55:46 prime com.apple.wikid[1400]:     observer = self._getLogObserver()
    Sep 14 14:55:46 prime com.apple.wikid[1400]:   File "/usr/share/caldavd/lib/python/twisted/scripts/_twistd_unix.py", line 140, in _getLogObserver
    Sep 14 14:55:46 prime com.apple.wikid[1400]:     logFile = logfile.LogFile.fromFullPath(self._logfilename)
    Sep 14 14:55:46 prime com.apple.wikid[1400]:   File "/usr/share/caldavd/lib/python/twisted/python/logfile.py", line 47, in fromFullPath
    Sep 14 14:55:46 prime com.apple.wikid[1400]:     os.path.dirname(logPath), *args, **kwargs)
    Sep 14 14:55:46 prime com.apple.wikid[1400]:   File "/usr/share/caldavd/lib/python/twisted/python/logfile.py", line 147, in __init__
    Sep 14 14:55:46 prime com.apple.wikid[1400]:     BaseLogFile.__init__(self, name, directory, defaultMode)
    Sep 14 14:55:46 prime com.apple.wikid[1400]:   File "/usr/share/caldavd/lib/python/twisted/python/logfile.py", line 32, in __init__
    Sep 14 14:55:46 prime com.apple.wikid[1400]:     assert os.path.isdir(self.directory)
    Sep 14 14:55:46 prime com.apple.wikid[1400]: AssertionError
    Sep 14 14:55:47 prime com.apple.launchd[1] (com.apple.wikid[1400]): Exited with exit code: 1
    Sep 14 14:55:47 prime com.apple.launchd[1] (com.apple.wikid): Throttling respawn: Will start in 4 seconds
    Sep 14 14:55:51 prime com.apple.wikid[1517]: /System/Library/Frameworks/Python.framework/Versions/2.6/Extras/lib/python/zope/__init__.py:1: UserWarning: Module twisted was already imported from /usr/share/caldavd/lib/python/twisted/__init__.pyc, but /System/Library/Frameworks/Python.framework/Versions/2.6/Extras/lib/python is being added to sys.path
    Sep 14 14:55:51 prime com.apple.wikid[1517]:   __import__('pkg_resources').declare_namespace(__name__)
    Sep 14 14:55:51 prime com.apple.wikid[1517]: /usr/share/caldavd/lib/python/twisted/mail/smtp.py:10: DeprecationWarning: the MimeWriter module is deprecated; use the email package instead
    Sep 14 14:55:51 prime com.apple.wikid[1517]:   import MimeWriter, tempfile, rfc822
    Sep 14 14:55:51 prime com.apple.wikid[1517]: /usr/share/caldavd/lib/python/calendarserver/tap/caldav.py:49: DeprecationWarning: mktap and related support modules are deprecated as of Twisted 8.0.  Use Twisted Application Plugins with the 'twistd' command directly, as described in 'Writing a Twisted Application Plugin for twistd' chapter of the Developer Guide.
    Sep 14 14:55:51 prime com.apple.wikid[1517]:   from twisted.scripts.mktap import getid
    Sep 14 14:55:51 prime com.apple.wikid[1517]: /usr/share/wikid/lib/python/twisted_overrides/microdom.py:176: SyntaxWarning: assertion is always true, perhaps remove parentheses?
    Sep 14 14:55:51 prime com.apple.wikid[1517]:   assert (oldChild.parentNode is self,
    Sep 14 14:55:52 prime com.apple.wikid[1517]: Traceback (most recent call last):
    Sep 14 14:55:52 prime com.apple.wikid[1517]:   File "/usr/share/caldavd/bin/twistd", line 19, in <module>
    Sep 14 14:55:52 prime com.apple.wikid[1517]:     run()
    Sep 14 14:55:52 prime com.apple.wikid[1517]:   File "/usr/share/caldavd/lib/python/twisted/scripts/twistd.py", line 27, in run
    Sep 14 14:55:52 prime com.apple.wikid[1517]:     app.run(runApp, ServerOptions)
    Sep 14 14:55:52 prime com.apple.wikid[1517]:   File "/usr/share/caldavd/lib/python/twisted/application/app.py", line 694, in run
    Sep 14 14:55:52 prime com.apple.wikid[1517]:     runApp(config)
    Sep 14 14:55:52 prime com.apple.wikid[1517]:   File "/usr/share/caldavd/lib/python/twisted/scripts/twistd.py", line 23, in runApp
    Sep 14 14:55:52 prime com.apple.wikid[1517]:     _SomeApplicationRunner(config).run()
    Sep 14 14:55:52 prime com.apple.wikid[1517]:   File "/usr/share/caldavd/lib/python/twisted/application/app.py", line 423, in run
    Sep 14 14:55:52 prime com.apple.wikid[1517]:     self.logger.start(None)
    Sep 14 14:55:52 prime com.apple.wikid[1517]:   File "/usr/share/caldavd/lib/python/twisted/application/app.py", line 251, in start
    Sep 14 14:55:52 prime com.apple.wikid[1517]:     observer = self._getLogObserver()
    Sep 14 14:55:52 prime com.apple.wikid[1517]:   File "/usr/share/caldavd/lib/python/twisted/scripts/_twistd_unix.py", line 140, in _getLogObserver
    Sep 14 14:55:52 prime com.apple.wikid[1517]:     logFile = logfile.LogFile.fromFullPath(self._logfilename)
    Sep 14 14:55:52 prime com.apple.wikid[1517]:   File "/usr/share/caldavd/lib/python/twisted/python/logfile.py", line 47, in fromFullPath
    Sep 14 14:55:52 prime com.apple.wikid[1517]:     os.path.dirname(logPath), *args, **kwargs)
    Sep 14 14:55:52 prime com.apple.wikid[1517]:   File "/usr/share/caldavd/lib/python/twisted/python/logfile.py", line 147, in __init__
    Sep 14 14:55:52 prime com.apple.wikid[1517]:     BaseLogFile.__init__(self, name, directory, defaultMode)
    Sep 14 14:55:52 prime com.apple.wikid[1517]:   File "/usr/share/caldavd/lib/python/twisted/python/logfile.py", line 32, in __init__
    Sep 14 14:55:52 prime com.apple.wikid[1517]:     assert os.path.isdir(self.directory)
    Sep 14 14:55:52 prime com.apple.wikid[1517]: AssertionError
    Sep 14 14:55:52 prime com.apple.launchd[1] (com.apple.wikid[1517]): Exited with exit code: 1
    Sep 14 14:55:52 prime com.apple.launchd[1] (com.apple.wikid): Throttling respawn: Will start in 9 seconds
    Sep 14 14:56:02 prime com.apple.wikid[1530]: /System/Library/Frameworks/Python.framework/Versions/2.6/Extras/lib/python/zope/__init__.py:1: UserWarning: Module twisted was already imported from /usr/share/caldavd/lib/python/twisted/__init__.pyc, but /System/Library/Frameworks/Python.framework/Versions/2.6/Extras/lib/python is being added to sys.path
    Sep 14 14:56:02 prime com.apple.wikid[1530]:   __import__('pkg_resources').declare_namespace(__name__)
    Sep 14 14:56:02 prime com.apple.wikid[1530]: /usr/share/caldavd/lib/python/twisted/mail/smtp.py:10: DeprecationWarning: the MimeWriter module is deprecated; use the email package instead
    Sep 14 14:56:02 prime com.apple.wikid[1530]:   import MimeWriter, tempfile, rfc822
    Sep 14 14:56:02 prime com.apple.wikid[1530]: /usr/share/caldavd/lib/python/calendarserver/tap/caldav.py:49: DeprecationWarning: mktap and related support modules are deprecated as of Twisted 8.0.  Use Twisted Application Plugins with the 'twistd' command directly, as described in 'Writing a Twisted Application Plugin for twistd' chapter of the Developer Guide.
    Sep 14 14:56:02 prime com.apple.wikid[1530]:   from twisted.scripts.mktap import getid
    Sep 14 14:56:02 prime com.apple.wikid[1530]: /usr/share/wikid/lib/python/twisted_overrides/microdom.py:176: SyntaxWarning: assertion is always true, perhaps remove parentheses?
    Sep 14 14:56:02 prime com.apple.wikid[1530]:   assert (oldChild.parentNode is self,

    This article solved my problem
    http://support.apple.com/kb/TS2915

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