I've cleaned the old and used a new paste.
When it boots it works normaly until I power it off.
The fans start normaly.
The screen is completly black no chime and the power led fade in and out.
AS for the OS I don't think is relevant at this boot level but is Leopard with all the updates, sorry can't remember the version.
I think that is somthing related with soldering that expands with the heat and stops making contact.
As for a problem with the sensor, it could be but I think it would't work hours without shuting down.
In the original state it only booted twice in 3 months...
Then a friend told me to try a heat gun.
So we did it very carfuly for keeping the components in place and using a screw driver to apply a small pressure.
First we did it in the CPU and after in the chipset, and now is in this state that is far better, it boots every day as long as is cold!
Hey Miguel, does this problem occur when the laptop is plugged into AC power, battery power, or both? Have you tried to cold-boot it on AC power only (battery removed)?
Miroslav Djuric 의
The problem occurs always (battery or A/C) and when I reassembled the MBP I've replaced the thermal past.
As for the fans they are both running and even with the keyboard opened after 1 or 2 min running if I restart the MBP it dosen't boot and it dosen't seem to be hot enough to stop working.
Forgot to refer that I also tested it only with A/C and replaced the battery, memory, HDD and CD.
I'd say that there is a probably a crack in one of the boards (logic/left I/O) that expands and contracts when it heats and cools. Could also be a solder joint that's doing the same thing.
I have the same opinion as mjuergens.