IamTimTech :
When you are in bios your board can often give your processor more voltage than it would otherwise, try checking your temps from Windows. I like HWmonitor.
If your temperatures persist I feel that it isn't your board that is failing, but perhaps your motherboard causing extra resistance, which in turns creates heat.
You can also try setting your settings in your bios for CPU voltage to manual but do not change the values, just leave them at their default. This works for a lot of people.
If all else fails it may be time for a new computer :-( (I know that can be easier said than done)
The only thing in that entire monologue that made sense is the fact that when you're in the bios the system does in fact provide full spec voltage, with no decrease in voltage or multiplier, therefore no "idle" type environment. This will cause a slightly higher "sitting" temp, maybe 5-10 degrees above what you'd see at idle on the desktop. It would certainly not cause a 65 degree temp just due to being in the bios. 65 degrees is what you should see after running Prime95 in full stress for fifteen minutes, not sitting idle or navigating the bios.
The motherboard does not "create" more resistance. EVER. The resistance of the motherboard circuitry is precisely designed for the chipset, CPU and hardware that will be used with it. If the motherboard were causing higher temps it would be due to faulty VRM's, dust choked heatsinks or a short circuit that was causing a direct short thereby overvolting, well, probably everything, or at least some things. On a system that POSTS fine, but overheats, the motherboard is the last thing I'd suspect and it wouldn't be due to "resistance". It would be due to using the wrong voltage or incompatible hardware. If there was too much resistance in a circuit, it would likely burn out or simply cause a hardware failure. Or not POST at all.
Changing the CPU voltage to manual, but not changing the values, is the same as doing nothing at all. I have no idea where you got that idea, but it's definitely incorrect. Even manually set voltages will fluctuate somewhat due to other settings and features baked into the bios control functions. This theory is simply full of fail. Now, manually setting a LOWER voltage might decrease temps, but it's also likely to create instability, depending on various other factors. If the system is set to default settings and not overclocked, it should not overheat unless the CPU or motherboard are purely faulty or the cooling system is not working.
I'd highly recommend taking the CPU heatsink back off, removing the CPU and using a magnifying glass or other device to inspect both the motherboard and cpu for bent pins or sockets. Bent pins can short the CPU and cause a voltage/heat issue as well as a lack of cooling. I'd also make absolutely certain that nothing, including the clasp that locks down the CPU, is interfering with the heatsink being fully seated on the CPU lid. CPU temps that rapidly shoot up are usually due to no thermal paste or incorrect/obstructed heatsink mounting. It could also be a faulty BIOS thermal table, which a bios update is likely to correct. Having an unsupported CPU that requires more voltage than the system was designed to handle could also create issues. Low end motherboards with high end CPUs often present such issues.
Knowing your full hardware specs as I asked for before would certainly be a good place to start. Another possible issue could be using a cooling fan that was not designed for use with a CPU of a specific TDP. If the fan you're using is the one that came with the processor, or a decent aftermarket cooler, it should not be to blame. If it was one off a different CPU, it might not be up to the task, but without knowing your hardware, it's impossible to say.
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