Well, I have 2 batteries which both are pretty much dead (only hold a charge for like 15 min). But I tried with and without the battery connected. Still get the same result. Its a Compaq Presario 2100 laptop.
I actually got it to boot into windows. I still don't know whats up with it though, I just got up from my power nap and tried it right now and its up and running. So right now I'm just monitoring the temps to see if maybe its an overheating issue.
Behold! I have found the culprit of the laptop issue. Seems the fan stopped working and was making the computer overheat and shutdown. It was my first time disassembling a laptop so I was a bit on edge. Well, after some cleaning and putting it back together, everything seems to be working fine. The temps have also went way down, so its much cooler now. Just dont know how I ended up with 2 screws left over