hdmi no signal

A day ago my monitor stopped receiving signal from the PC with the "HDMI No signal" message appearing. I went through all the different troubleshooting methods I could find and still can't get a signal out of it. The graphics card lights up and runs like it would normally, in both PCI-E slots...

Hi, when playing games and sometimes when returning to my computer after a while, I notice the screen being black and have no other option but manually restart my computer. When this occurs first the sound cuts out making a buzz static like noise through the speakers for about 3-4 seconds...