XPS m1330 will not start up. CAPS Lock & Scroll Lock blinking.

About a year ago, my m1330 decided to just stop working (conveniently a month after the warranty expired) and each time I tried booting it up, I could hear the hard drive start to move but the fan would not start and the CAPS and Scroll Lock button were blinking

I gave up on troubleshooting it for a year and decided a few days ago to pull it out to look at it again since I still could not get over that I only got barely over a year's worth of usage out of a $1800 laptop. I hit the power button and miraculously it fired up and worked with no issues. When it was on, I did every test possible and there were no issues reported. Then the computer went to sleep for the night and I came back down the next morning and of course I hit the power button and the computer would not start up and the CAPS Lock and Scroll Link were blinking again.

Now, after endless Googling and message board hunting, I understand the issue is more than likely the memory. I also understand the fix to this is taking the memory out and trying it in different slots. Well, I have done this with both sticks. I've swapped them and used just one stick in slot A and slot B. This has been a fix for a lot of people's issues but it has not worked for me. No matter how I do it, the computer still will not boot. 

My question is could this possibly be an issue with the motherboard or just the DIMM slots themselves or is there something I am just missing? I have not tried a third stick of the RAM yet. I have been trying to isolate which RAM chip it could be that is bad and I am wondering what the odds are if both RAM chips stopped working. 

The thing that has me hung up is how after leaving it alone for a year that it would all of a sudden started working for a night then stop working again. 

Any help is appreciated. 

Thanks.