Extreme overheating problems

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hey all

I have recently purchased a new system, that has been switched on for first time today, and after around 2 minutes, the computer seems to switch itself off.

Initiallly I thought it was power suppy issue, because when I switch it on, the computer powers up for only a second, then powes down for a second, then it stay powered up until overheating occurs.

Is this normal for a power supply?.

Key component specs are:

Intel core 2 duo E6300 (not overclocked), Gigabyte GA_965P_DS3 Motherpoard and my power supply is EZCOOL PS-900 700 watt version 2.2 tornado.

At a hunch, that it could possibly be overheating, so I managed to, when booting , to gain access to my bios and check hardware monitor (cpu temp), after 10 seconds of being on , the proccessor read at 70 degrees and in space of 5 seconds climbed to 90 and then shut off. What could cause the proccer to rapidly overheat when sitting idle after 2 minutes boot (no operating system installed)

Is the power supply switching on and off related to temperature climb, any help or comments would be greatly apperciated.

Tomorrow I plan to set up the computer components out of the case on a desk, just to make sure that the case is not shorting out the computer. I also plan to re-seat the heatsink and processor, what else would you suggest I try, other then this.

Thanks fror reading

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Built my machine out of the case on a desk, re-seated cpu and now temp readings are fine, what I think it was is that the heatsink wasnt seated properly resulting in it not coming in contact with processor.

Ive got a new psu (different from psu previously tried), im still having the on/off power issue at start, it doesnt effect computers booting, however im a little worried about it.

Do you have any ideas why it would do such a thing?

I rang up a engineer from company who i purchased components from, and he said it could possibly just be a sticky power button, i tried one from another case and problem still occured.

It only happens on first power up, however if i restarty myself, or keep my finger on power buttoin for a few seconds it switches off band then i switch it back on it doesnt occur.

Any ideas?