Question My LG monitor says no signal on startup

Apr 5, 2019
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I did my yearly clean of the PC and also checked to see if I had a slot for my SSD,
No problems there, so I reconnected all the wires and all that and turned on the PC which was turning on my monitor was checking signal and I was waiting ready to play some games and find no signal, I reconnected the DVI cables thinking they might be loose but to no avail, tried it atleast 5 times switching cables back and forth still nothing, tried to change the input using the joystick but didn't work tried unplugging ram and wires from PC and reconnecting, still doesn't work, tried unplugging the power cable of moniot and PC and waiting for a few minutes and still does not work l, I desperately need help I have been troubleshooting for 3 hours