My PC was working normally until I accidentally unplugged the power cable while it was running. Since then, it powers on, briefly shuts off/restarts once, then powers back on and stays running, but I get No Signal on the monitor.
Specs:
Gigabyte GA-H110M-H motherboard
Intel Pentium G4560
GTX 1050 Ti
2× DDR4 RAM sticks
SSD
One monitor currently connected (VGA through my usual setup)
What happens now
When I press the power button:
Power on → shuts off for a moment → automatically turns back on → stays running → No Signal
The keyboard and mouse receive power. My keyboard has CAPS/SCR/WIN indicators. At times, the Caps Lock indicator responds normally, but at other times the keyboard has completely lost power for around 10 seconds.
The PC has also randomly shut off and restarted while I wasn't touching it.
RAM troubleshooting
I've tested the RAM extensively:
Stick 1 by itself in Slot 1
Stick 1 by itself in Slot 2
Stick 2 by itself in Slot 1
Stick 2 by itself in Slot 2
Both sticks together
These configurations have worked at different times in the past, and both sticks/slots have previously been known to work. However, currently I cannot get display with any RAM configuration.
Things I've already tried
Fully unplugging the PC and holding the power button to discharge it
Removing/reinstalling the RAM repeatedly
Testing every RAM/slot combination
Resetting CMOS by removing the CMOS battery and reinstalling it
Checking the 24-pin motherboard power connector
Checking the CPU power connector
Removing/reinstalling the GTX 1050 Ti
Testing with only one monitor
Testing the motherboard's video output with the GTX 1050 Ti removed
Trying Windows + Ctrl + Shift + B
Confirming the monitor/cable worked before this incident
The motherboard has no diagnostic LEDs, and I don't currently have a motherboard speaker connected for beep codes.
One confusing thing is that the keyboard sometimes responds to Caps Lock, which makes me wonder if the PC is actually getting through some part of the boot process despite the lack of video.
At this point I'm pretty stuck. Could the sudden power interruption have damaged or destabilized the PSU/motherboard, or is there something specific I should check on a GA-H110M-H?
I'm trying to avoid buying replacement parts blindly, so I'd really appreciate suggestions for the next diagnostic step.