Compaq won't boot.

I only tried removing the battery (not CMOS or BIOS,the MAIN one) and hold down power button for 45 secs.Reassorted everything and did not had any effect.
 
If you can access the cmos(bios) battery then try doing that. Other than that, I would think you have a bad motherboard.
 
I think I have,it sorta looks like a "plug" and it's quite small(it's kinda formed like battery),if I unplug it,laptop won't turn on,is this the one?
 
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