Changing CPU clock ratio - computer fried ?


I'm really afraid my computer might have been permanently damaged because of a light but failed OC, even though I've made other attempts a few months back, that failed too, but the computer never got damaged.

This time I have only changed the CPU clock multiplier from 36 to 40 (4ghz target is ok and my CPU cooler is good)

but after applying it the computer just won't turn on again
The fans are doing a single spin when i push the start button, and the motherboard displays some kind of C without a number as error code

So I just told myself it's okay, i just have to clear the CMOS, except i can't
I've tried every way of doing so, even waited overnight with the mobo battery pulled out
Also tried a bare-bone start, no success
I tried with other RAM sticks and didn't work either

I haven't seen any sign of toasted component on the mobo, and I didn't smell any smoke when it happened

dead mobo ? dead psu ? dead cpu ? is any of them actually dead ? I really don't know...

CPU : i5 4670K Haswell
MB : Gigabyte GA-Z87X-UDH3
RAM : 2x 4GB Corsair Vengeance
PSU : Seagate M12 II 750W
GPU : Gigabyte GTX 970

Thanks for your answers
Reply to plissken2107
1 answer Last reply
More about changing cpu clock ratio computer fried
  1. You may have ruined your motherboard, but there is no way to know for sure unless you can get it to post.
    Reply to KirbysHammer
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