Check the heat sink again. If you've used paste (which you should have) the print left on the heast sink/CPU should be even when you take it off. If you've used screws to attached the heat sink to the motherboard make sure they're tightened evenly.
Switch the machine back on and set the motherboard back to it's factory settings, the voltages etc should be auto detected.
There's no way you should be getting temps that high at idle if the heat sink is on correctly.
Oh and take your time and be careful. Is easy to break stuff when you're frustrated
Did you remove the plastic that protects the three gray strips before you mounted the heat sink? Is the impression left on the three gray strips by the CPU even all the way round?
unless your temps have fallen to about 30 when idle, increasign the voltages will most likely increase your chances of killing the cpu, i would be patient and wait for someone with more knowledge before tryign anything else.
The purpose of the paste is to allow heat to transfer from the cpu to the heatsink as easily as possible. It does this by making sure that the cpu and the heatsink have a good contact.
The paste should ideally be as thin as possible with the heatsink and cpu being in close contact.
What I tend to do is to use something like a stanley blade to spread the paste onto the cpu really thinly before making sure the the heatsink then sits firmly on top.
From you photo it looks like the heatsink is not locating properly onto the cpu. Make sure that there are no washers or obstructions in the way.
I'm pretty certain that this is your issue so at least if you get this sorted then you should be good to go....
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