iMac starts up then shuts down

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iMac shuts down after startup

IMac 2006
When I start it up the logo comes on and the icon spins.
This continues for about a minute and then the computer shuts down.
I have reset the pram and tried to start in safe mode by holding down the shift key.
Every time the results are the same.
Grey screen, tone, logo, spinning icon, shutdown after about 1-2minutes.
Please help.
 

pigoo3

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Your Mac's Specs
2017 15" MBP, 16gig ram, 1TB SSD, OS 10.15
Threads merged...not necessary to TRIPLE post. Thanks
 
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pardon

Wasn't sure where to post it. thanks for the heads up.
 
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Sound like the firmware is messed up. Have you tried to boot from a OS install disc.
 

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