How to start pc?

Question

Computers

Good day. The PC went into sleep mode after that I had to reboot because neither the keyboard nor the mouse worked.
After the reboot, the PC started up but there was no image on the monitor. I had to pull out the battery, after that the image appeared. Saved exited bios. After that, nothing is displayed on the monitor, fans and coolers are spinning. I tried to reset the BIOS, took out the battery, stuck a jumper on the clrtc, there was no sense. I took out the RAM, etc. the speaker is silent, the indicator on the motherboard is lit. On the front panel, the hdd indicators and so on do not light up. The off and reset buttons don't work. After starting, you have to remove it from the outlet. I made a test bench to sense 0. The motherboard is an old socket 755 chipset p45 p5qse2


There are a lot of different projects left on laravel and so on. Not soon I will assemble on lga 1151v2, 1200 or am4