Windows 10 random Black Screen after sign in

Hello everyone.

I have search though a few websites and I cannot find any solution to my problem.
Anyway, what I think is that maybe my motherboard or hardware have problems. Before doing anything to the hardware, any advice or solutions that I can try? My black screen problem is after I sign into Windows, there is display and everything. Once I sign it, the black screen problem can occur anytime. Can be after a few minutes, or few hours. Never know. But what I can confirm is that, if I'm playing music, although the screen is black, the music is still going. So what I think is that the Windows still running but there is no way to wake up the monitor. I also disable the "Allow to turn off this device to save power" options and enable the mouse and keyboard to wake the computer up.

Also let me describe the hardware problems, which is, sometimes when I switch on the main switch and press on the power button to start my desktop, there is no response. I need to open up the casing and maybe remove and reinsert something, switch off the main switch, turn it back on, then only it will work, or maybe sometimes this also doesn't help.

Thanks! Hope to see any reply soon!

Bump. Anyone? Thanks!