Asus Laptop Repair

On the holiday my Uncle was trying to fix his brother's Asus laptop, It would power on and off but it couldn't get to the BIOS screen. We did the normal tests by removing the ram and hard drive but nothing worked. We ended up taking the whole computer apart to have a look inside. I tested the capacitors under the cpu and they all looked good. There were no shorts anywhere that I could see, the only real solution to this problem would be to buy a new motherboard or maybe heat the motherboard up to fix a bad solder joint.