Precision T5400 Thermal error on boot.

( Note: I posted this once, then was asked to agree to terms of service then my post after composing, vanished withut a trace )

I have a Precision T5400 Dual 3.2GHZ Xeon total 8 cores, 48 GB Ram, Zotac 8GB Nvidia graphics used to render graphics.

When I boot 90% of the time it halts with error "Thermal compromise....replace cover and reboot"

Cover is on? I even suspected switch as some suggested so bypassed it and no change so it is NOT the switch.

Often must shut down and reboot as many as 5 to 10 times before it will boot. Once it boots it runs fine. Often with a long animation to render it may run for several days and never has an issue and never over heats. So I don't believe there is actually any real thermal issue.

Others have reported this but none of those posts were ever updated so if someone found a solution they never bothered to share.

Anyone have an idea how to resolve this? Is there a setting in BIOS to disable that check? Is there a newer bios
( as of now I don't know the bios version because I got tired of pushing the button over and over to try to boot it )

Of course DELL support is long over and even search in their site indicates they don't remember they ever made this LOL

Its a great render machine once booted....don't want to use as boat anchor.

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Win 7 64 Premier though that's irrelevant to bios.

Thanks.

Paul