Either the cheap part (CMOS battery) or the expensive part (motherboard.) You can't imagine how many times it's one or the other.
It is an old sony vgn-fs810ZW. I think that i left it on the vent for the fan so i put on some new thermal grease on the cpu hoping that would fix it. if i take the heat sink off of the cpu and then put it back together then led come on for a second and then shut off. Otherwise nothing happens. Any ideas wat is wrong

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