Severe Computer Malfunctioning?

[dante]

First off, the specs of the things I've listed it down to these 3 things for as to what could be causing my problem, which will be explained below (This is on a desktop, btw):
- AMD FX-8150 Zambezi 3.6GHz Socket AM3+ 125W Eight-Core Desktop Processor FD8150FRGUBOX
- ASUS M5A99FX PRO R2.0 AM3+ AMD 990FX SATA 6Gb/s USB 3.0 ATX AMD Motherboard with UEFI BIOS
- HIS H675F1GD Radeon HD 6750 1GB 128-bit GDDR5 PCI Express 2.1 x16 HDCP Ready CrossFireX Support Video Card with Eyefinity

Basically, I'll list the type of errors that would occur, in the order they'd occur.
1. constant freezing issues ever since first built (occured MUCH less when increasing speed of the cooling fan)
2. computer would revert to crappy graphics irreversably and go through so many glitches out of nowhere (this would literally happen within a matter of minutes with no farwarning) and I would be forced to DBAN my harddrive and restart everything from scratch. This has occured 5 times, but I know it's not my harddrive because I've tried with 2 completely different harddrives and same problems occur.
3. computer wouldn't install updates; CONSTANTLY froze even when just checking for updates.
4. display won't work AT ALL. My monitor won't even detect anything is there. (other devices still are detected flawlessly).

My opinions to this problem:
1. The CPU suffered too much heat damage (which honestly, wouldn't surprise me)
2. Motherboard has suffered some sort of damage.
3. Broken graphics card (no idea how it'd break, though. I never pushed it's limits. fan still works fine.)

It wouldn't be my power supply. I've never had power problems with it before. I'm confused at to what is going on here, and I don't want to take it some store where some douche is going to charge me $100 JUST to say, "the _______ is causing the problem," and then not even fix it without first slapping on another $200-$300 fee.
Any opinions as to what could be causing this problem? I hope to hear from some of you guys soon it would be greatly appreciated!!
@Torgo- no, it's real, not hacked. Also, there isn't really much of a way I can check the hard drive if I can't see anything the computer is displaying...
Also @Torgo - I can bear with a lack of updates if that can't be fixed. The problem here is that the computer (in some way, shape or form) is BROKEN. That's the major problem here.
You know what...to make this easier, here's just my full setup:
AMD FX-8150 Zambezi 3.6GHz Socket AM3+ 125W Eight-Core Desktop Processor FD8150FRGUBOX
ASUS M5A99FX PRO R2.0 AM3+ AMD 990FX SATA 6Gb/s USB 3.0 ATX AMD Motherboard with UEFI BIOS
HIS H675F1GD Radeon HD 6750 1GB 128-bit GDDR5 PCI Express 2.1 x16 HDCP Ready CrossFireX Support Video Card with Eyefinity
Western Digital Caviar Blue WD5000AAKX 500GB 7200 RPM 16MB Cache SATA 6.0Gb/s 3.5" Internal Hard Drive -Bare Drive - OEM
COUGAR A-Series A560 (CGR B3-560) 560W ATX12V SLI Ready CrossFire Ready 80 PLUS BRONZE Certified Ultra Quiet Power Supply
CORSAIR Vengeance 8GB (2 x 4GB) 240-Pin DDR3 SDRAM DDR3 1600 (PC3 12800) Desktop Memory Model CMZ8GX3M2A1600C9R
Rosewill RNX-G300EX Wireless Card IEEE 802.11b/g PCI Up to 54Mbps Data Rates 64/128bit WEP WPA WPA2 802.1x, 802.11i, AES, TKIP with 100cm cable external 2 dBi Antenna