ok, so care to shed some light to "your condition"? how did you word your power search, 'reboot loop', 'automatic reset' 'unable to boot maemo', what? like mentioned before, plenty of documentation plus firmware flash wiki if you need it.

1) is your phone brand new or you've had it for a while? if you've had it for a while, what firmware and kernel version are you on?
2) any recent app installations and if so, from where: extras, extras-testing or, extras-devel?
3) have you been messing around with NITDroid, Meego, multiboot/uboot etc?
4) have you tried removing your battery for a few minutes and then powering up again?

revisit the power search answers, i'm about 90% sure you'll find your answer there. otherwise you gots to spit out some more info before help will be on the way.

good luck.