PC unable to boot.

I would say it is the motherboard. CPU's don't fail often.

Can't you RMA the board? Motherboard's usually have three year warranties.

I would normally agree, it's usually the MB, but it can be the CPU, I had an Athlon FX 5200 which just died for no reason, only on video encoding., every video encode would send the CPU in to meltdown with lock-ups.
Changed the RAM with 100% working set, changed PSU with 100% working box, changed GFX Card with 100% working card and even used on-board DX GFX, even changed the MB, yet it still still occurred.
Logic dictated the CPU, replaced with a FX 5800 on the old hardware and it was fine till I upgraded to a Phenom X4
 
Looks like the OP needs a new CPU then...

Very, very unusual. Not had a CPU failure in over a decade.

If the CPU is OEM and out of the 12 month warranty, I would say that Sale of Goods Act 1979 (?) would still give you grounds for a partial refund. You would expect a CPU to last five years plus. So I think the OP has good grounds to pursue the seller for a replacement/refund.
 
Update:

From Overclockers UK's RMA Emails:

Motherboard is being sent to manufacture for repair/replacement.
CPU is being sent to manufacture for repair/replacement.

Not the end of the world.

If the CPU is replaced, does the Warranty count for 1 year when I receive the replacement or 1 Year from when I purchased the original one. (I would assume 1 Year from when I get the replacement).
 
Update:

From Overclockers UK's RMA Emails:

Motherboard is being sent to manufacture for repair/replacement.
CPU is being sent to manufacture for repair/replacement.

Not the end of the world.

If the CPU is replaced, does the Warranty count for 1 year when I receive the replacement or 1 Year from when I purchased the original one. (I would assume 1 Year from when I get the replacement).

Ouch, so looks like you fell foul of what that article mentioned then. Warranties are from original date of purchase, never heard otherwise.
 
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