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Sounds like your fan(s) are dead on your CPU or GPU. Take the side off while it's on and investigate.
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Pretty sure the GT610 is passively cooled, so that means it would either be a case fan or a CPU fan going out.
I would advise seeing if the CPU fan is spinning while the PC is on. If it isn't, then replace it. if it is spinning, try replacing the thermal paste.
I wouldn't be so sure that its a dead motherboard, if the CPU was running at 100C+ there's a good chance that the CPU died.