Random BSOD Codes Cannot Get Into Windows

"2 years ago I built my own PC, and every component was brand new, except my hard drive (which I got a new one shortly after). I installed Windows 7 and everything was going great during the install until my computer BSOD. I think to myself "Ok..." but the computer restarts successfully and I just shrug it off in the typical "Oh Windows..Jump to a few months later. I start having BSOD every few start ups, until it eventually got to where it was more often that not. The odd thing was, it would only BSOD during startup, and once it was up, it ran like a champ. So my lazy solution was just usually put my computer on standby. Well, then comes a day when I have to restart my computer for some program or driver installation, and the computer never comes back on. Try to use Startup Repair on the Recovery Disk, but to no avail. I suspected my RAM, so I swapped it out with another (compatible) set I had available. Unfortunately, the computer would never start up. It would literally not power up. So I ended up replacing the motherboard. Now my computer starts up fine, and my computer seems to be normal until.The BSOD soon returns, and I suspect that it could be a software issue. I reinstall Windows. This seems to fix the problem... for a little while. A few short weeks later the problem returned. I am severely frustrated at this point. I can't get Windows to boot more than 1 out of 20 start ups. I start running diagnostics. CHKDSK, memtest86, Seagate's Hard drive tools. Eventually it gets to where Windows won't start at all. What's worse, the recovery disk won't even boot. If I'm correct, this means that it can't be a hard drive issue?

I had a copy of Ubuntu available, and I install that on a small partition I hadn't used yet. It boots some of the time. Other times, it has issues as well.if I've replaced the motherboard, run Memtest86 with no errors, and am unable to boot to the recovery CD, does that mean that it is my processor at fault? From what I researched, processor defects are rather uncommon, and usually due to over heating (and I have a pretty substantial cooling system). The other thing that's niggling my brain is that my computer can run sometimes. For instance, I'm typing this on Ubuntu right now. If the processor is messed up, how is it running this at the moment?"I put my SATA drive (the original) in a different, working computer and it wouldn't start up either. So I switched to a different IDE hard drive and formatted it and installed Windows. It works for a few runs before it stops working completely and now no matter what I cannot get into Windows. Safe mode doesn't work. It crashes on the boot CD. Some (but not all) of my BSOD are actually green, but I don't know if that means anything special. [code]