Is my motherboard dead?

I have an ASUS motherboard P8H68-M LE Series

Recently in the past few days I began to experience crashes when overloading the PC with programs and such, which did not cause problems previously. It began to crash more and more, even with less strain on the CPU usage.

Now the PC isn't starting up at all, it tries to start to really pathetically spin the PSU fan once or twice then abruptly shuts off, I have tried switching the power supply unit into another rig and it works fine, and I tried switching another power supply unit into this motherboard and the same problems occurred.

There is an onboard LED that "indicates that the system is ON, in sleep mode, or in soft-off mode." This light does remain green on the motherboard

I shouldn't have been messing with it but the motherboard also has an "MEMOK!" switch for installing incompatible DIMM's with the motherboard and it's supposed to light red if there are faults, for some reason when I hold down this button after turning on the PC it does not crash, but I can't just keep holding down the button and also nothing seems to actually launch, since nothing is appearing on the monitor.

I reinserted the RAM that I had to make sure there was no problems there.

Don't know what to do, looks like the motherboard is dead?

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