I am working on a Gateway 3310. I looked but didn't see anything wrong, specifically no disfigured capacitors. I unplugged and/or removed all devices or pieces of equipment plugged into the MB. Still the computer wont turn on.

Now, onto the second problem. I plugged the HDD from the non working computer into my computer and it wouldn't boot, I couldn't even enter the bios to double check and make sure that the settings were correct to boot from the HDD. I plugged it into a USB external encloser and the HDD showed up correctly on my computer and I was able to explore the HDD like a regular working HDD. Bad MBR?