Hyper Transport Sync Flood - crashing, flickering monitor

[Pudd]

Main Questions:
What is causing the Hyper Transport Sync Flood?
What is causing the BIOS Recovery to start?
Is it a fault with one of my components, or do they just not agree with each other?

Hey everyone, I recently just installed a new graphics card into my PC. Unfortunately, I can't run it at the moment, so I can't get fully accurate specs.

MSI 770-G45 Mobo
10GB RAM - 1333MHz DDR3: 3x 2GB Corsair Modules
1x 4GB XMS3 Corsair Module


Old graphics card: Intel Radeon 5570
New graphic card: Intel Sapphire HD 6770

Processor: AMD ADX250OCGMBOX Athlon II X2 250 - 3.0 GHz AM3 CPU

I've had my mobo overclocked all of the time with the old card for over a year with no problems. I've underclocked it for now to see if that will make a difference. The new graphics card requires a connection to the PSU, which the previous one didn't, and the reason that I suspect it's the graphics card at fault is because my monitor started to flicker before going fully white and crashing.
I've investigated a little bit and have come to the conclusion that my graphics card is overheating (after 10 minutes of use?), and when I restart my PC, I get a black screen with all of my PC specs and a message saying:
A Hyper Transport sync flood error occured on last boot. Press F1 to Resume
I've asked a friend, but want another opinion on this. He said it's because of lack of cooling within my PC.
What can I do to fix this?

EDIT: Every time I restart now, It comes up with this message:

BIOS recovery requested. Starting BIOS Recovery...
Please insery USB flash Disk with BIOS file.
Checking for USB device...

EDIT: Fixed. Had to reset CMOS, then switch back to my old card. Reconfiguring my mobo now

EDIT: Just connected everything back up, with the old card. Getting the BIOS problem again.

EDIT: After about an hour of being shut down, it's decided to work again. However, when loading everything up, a list of all my components and peripherals were shown through a system message, which it's never done before.

EDIT: Reconnected the case fan and the BIOS recovery message occurred again. After another hour or so of being turned off, the PC started normally and hasn't crashed.

 

[Tmagic650]

Can you clean this post up a bit and ask your questions in a more direct and clearer way. Your "edit" style is not good

 

[Pudd]

Can you clean this post up a bit and ask your questions in a more direct and clearer way. Your "edit" style is not good

Tidied it up.

 

[Tmagic650]

Are you over-clocking? The Hyper Transport Sync Flood can be caused by not enough CPU voltage, or too low of memory VCC

 

[Pudd]

Are you over-clocking? The Hyper Transport Sync Flood can be caused by not enough CPU voltage, or too low of memory VCC

I was overclocking before I installed the new graphics card with no problems. I've had the PC for a good year or so and had no problems. Since these problems started to occur, the first thing I did was to switch the overclocking system off and it doesn't seem to have made a difference.

 

[Tmagic650]

So set the bios to defaults and see if the computer settles down

 

[Pudd]

So set the bios to defaults and see if the computer settles down

To clarify, I tap F2 when booting up, correct?