My computer gives me problems on start up

These are the things it will do. 1- monitor will not recieve signal. 2- it will start but then suddenly shut down and start up again. 3- will turn off and do a system dump (or something like that). When it finally starts working again after turning it on and off three times that it will work just fine.

I would suspect your computer is trying to talk to the external hard drive and not getting any reply. The conversations is probably, "Hello? Are you a boot drive? Who are you?" then it waits for an answer but the external drive does not answer. Timeouts of this nature could take as long as 5 minutes depending on the hardware.
Additionally, could you be accidently pressing a key during startup? Keypresses during startup can cause the computer to attempt to boot from an external drive, i.e.
Option-Command-Shift-Delete will seek a different startup volume (probably not your problem). Pressing T during startup will attempt to boot from a FireWire disk. Pressing C starts from CDROM and N starts from network.
Could your T key be sticking? This is probably a long shot.
Darrell
P.S. Pressing X, during startup, will force the machine to startup from Mac OS X. Maybe this will work for you.

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