The computer does not start, what should I do?

Question

Iron

Good day to all. The whistle-dance began about 2 weeks ago, when, having come home tired, my iron horse refused to work for me. It looks something like this: after pressing the power button, everything inside the PC comes to life (the monitor and mouse do not respond), then it turns off abruptly and turns on again, but without rebooting (the monitor, mouse and keyboard still do not work). There is also magic in this story ... When it first started, it was enough and purge, after which it worked as before. After 3 days, my horse started butting again, but nothing helped. Then he stood with me for a few more days and again earned. There are suspicions about the processor (obviously), because the red cpu_led light is on on the motherboard. Tell me please, experts, did anyone have it? Are there any solutions? Thanks a lot in advance.

Answer 1

Check the hardware, start with the power supply.

Answer 2

Looks like the motherboard is slowly dying.