Laptop troubleshooting forum: Asus N61JQ X1 - all kinds of problems. Please help.

Okay, I'm officially stumped here, so any help is appreciated.

I am trying to fix my roommate's old laptop. It is an Asus N61JQ X1 running Windows 7 64 bit.

He was initially getting a lot of BSOD's, and sometimes the computer screen would freeze and he would have to restart. I did a fresh install of Windows 7 after making a recovery cd with an iso I found online.

It was working better for a while, but then I started getting lots of BSOD's again. Most of them seemed to be pointing to memory, if I remember correctly, they were of the "IRQL_NOT_LESS_OR_EQUAL" variety.

So I ran memtest86+, and all kinds of errors came up for both sticks of ram, and the computer crashed halfway through the test. After I reset the computer, Windows automatically reset the computer for windows updates, but the computer crashed halfway through installing them.

Then I went to microcenter and bought two new 4g sticks (it only had 4g total before), and installed them.

When I turned the computer back on, I got another BSOD, I believe it was something like "stop 0x00000050", and a google search led me to believe it was caused by an error with the windows update, which would make sense since it never finished installing.

I reinstalled Windows again to fix the problem, because for some reason I don't have any restore points to go back to, but I am now being plauged by ANOTHER issue that has been recurring this whole time.

Sometimes, with or without a BSOD, I will hear the power supply shut off (like the noise it makes when you hold down the power button to shut off), and the computer will shut off. However, when I push the power button, instead of powering back on, the power light will slowly blink, and will not power back on. Usually if I either let it sit for a while, or pull out the battery and unplug the ac adapter for a few seconds, it will power back on again when I press the power button.

I don't believe it is the hard drive, because it is seated properly, and I ran crystal disk info and it says the drive is healthy.

Help!