P7N Diamond / Q6600 / HELP!

Question

Intro
Good Afternoon. I have searched everywhere for information regarding the issues I’m having and haven’t found anything, so I though id ask here. About a year ago I built two computers using the exact same parts (one for me and the other for a friend of mine). My friends build has been running perfect since day one, with no issues or errors. Mine however, has been a problem since I turned it on. I don’t want to post a confusing wall of text, but want to give as many details as possible, so here goes.
Problems
1)   Will not run with optimised settings since first install - Just restarts before starting windows. (Only boots ok when FSB is set to 1333)
2)   Looping Restarts – After powering on it will restart itself between 3-6 times after boot screen, then successfully boots onto windows ok.
3)   Crashing to Desktop/BSOD’s – Mainly runs ok when on desktop/applications/internet. Games are the issue. (Fixed some errors by replacing CMOS Battery. Main BSOD error “Hardware Error – Please contact your manufacturer”
Previous Tests Done
1) Cleared BIOS settings
2) Stripped it down to barebone (outside case), and removed everything It didn’t need to run.
3) Tried changing RAM - Dual/Single Channel – One stick at a time.
4) Memtest, Futuremark, Prime95, GPU-Z, CPU-Z and others.
*Currently have processor on RMA as it died (Have signal to monitor from Graphics Card, but no boot, so testing on the fly is impossible*
NOTE: All drivers are up-to-date, Computer Temperatures are more than low enough
*BIOS changes/setup*
Advanced BIOS Features:
   * CPU Feature
         o Execute Bit Support = disabled
         o Set Limit CPUID maxVal to 3 = disabled
   * Chipset Feature
         o HPET = disabled
Cell Menu:
   * D.O.T = disabled
   * Intel EIST = enabled
   * SLI Ready Memory = enabled
   * System Clock Mode = Manual
         o FSB Clock = 1333
         o DRAM Clock = 800
   * Adjust CPU Ration = 9
   * Advanced DRAM configuration
         o DRAM Timing Mode = Auto
   * Adjust PCI-E Frequency = 100
   * Auto disable DRAM/PCI Frequency = enabled
   * CPU Voltage = Auto
   * DRAM Voltage = Auto
   * NB Voltage = Auto
   * SB Voltage = Auto
   * FSB Terminator = Auto
   * --- All other voltages are left on "Auto" ---
   * Spread Spectrum = disabled
Computer Specs:
Case: Thermaltake Armour+ VA3000
MB: MSI P7N Diamond
MS-7510 Ver1.0 (Rev1.0) (A7510-NMS100) (Bios Ver: 1.4)
HDD: 1 X Western Digital 500GB - SATA (WD500DAAKS)
GPU: 1 X BFG GTX-280OC PCI-E
CPU: Intel Core 2 Quad Q6600 - 2.4GHZ/8M/1066/05A (SLACR)
CPU FAN:Zalman CNPS9500 AM2
MEMORY: Corsair Dominator-XMS2-PC8500 1066Mhz DDR2 – 2.1v
OTHER CARDS: Sound Blaster X-Fi Xtreme Audio (Free with Motherboard)
OS: Windows Vista Ultimate 64Bit – SP1
PSU: Hiper Type-M SLI 1000w
*Air Cooling: 5 x Internal Fans, 9 including CPU/GPU/PSU/RAM
PSU IMG:
Additional Information:
As mentioned earlier, my Q6600 is in the process of RMA so can’t really do any testing with Bios or anything else. Another thing… When on the phone to Intel’s Technicians. They said that due to the board only having 1.8v DIMM’s, they said because my RAM was 2.1v, it is those that are causing all my issues. In relation to the RAM spec on the listed computer configuration, could anyone confirm that? As I asked Corsair before the build and they said it would be fine.
I hope I’ve given all the required details, needed for a conclusion to my problems or even a guess.
Overall, Thankyou for reading. Any help/advice is much appreciated. 

Answer 1

Quote
1)   Will not run with optimised settings since first install - Just restarts before starting windows. (Only boots ok when FSB is set to 1333)
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         o FSB Clock = 1333
Mh, did you mistype something, or are you talking about overclocking when you mention "optimised settings"?  I mean:  FSB 1333 is already higher than the native FSB Speed of a Q6600 (=266 MHz or 1066 MT/s effectively).  Can you explain again what you mean?  Because if you really overclocked the FSB/CPU to 333 MHz FSB CLock Speed (and higher) all your problems may simply be the symptoms of non-stable overclocking settings (which is nothing unusual).
Quote
MEMORY: Corsair Dominator-XMS2-PC8500 1066Mhz DDR2 – 2.1v
Quote
Another thing… When on the phone to Intel’s Technicians. They said that due to the board only having 1.8v DIMM’s, they said because my RAM was 2.1v, it is those that are causing all my issues. In relation to the RAM spec on the listed computer configuration, could anyone confirm that?
Yes and no.  The native speed of your modules is DDR2-800 @1.8V +/- 0.1V (JEDEC Standard) which means that such a setting is compliant with the industry specifications for DDR2 Memory and should pose no stability risk to the system (given that none of the modules are faulty).
DDR2-1066 on the other hand is an OC rating that requires you to raise the voltage to 2.1V and thereby above industry specifications.  Stability problems @DDR2-1066//2.1V are not unusual.  So in that perspective, the stuff the Intel Technicians pointed out to you is absolutely correct.