Windows 10: No display after clearing cmos

I've been trying to fix my pc which hasn't worked for a few years. It was saying i needed to reset the bios but i couldn't go into the settings so i cleared the cmos and tried booting it back up but there's no display to my tv, the fans and lights run.ive tried removing the battery and pushing the power button for 30 secondsremoving the graphics card and putting it back inusing all the hdmi ports including the ones connected to the graphics cardMB: ROG STRIX B350-F GAMINGSSD: crucial bx500 240gbPSU: MWE 550 Bronze

:)

 

clear CMOS

As @Law- II said .....

please fill your system specs.
If you have a desktop motherboard i would suggest to see if you CMOS battery is not dead.

 

Boot only with cmos cleared

Law-II: Thank u so much for helpinh but I had already done those steps. I'm testing with minimal hardware and single dimm at a2.

As I said. If I clear CMOS or run MEMOK button the system boots and I can run windows8 stable and fine using F8 (boot menu) but whenever I restart or save any bios settings (save and restart) the system doesn't post anymore.

 

Have to clear CMOS to start comp?

Computer has been runing fine for about a year now, today when I tried to start it up the screen just stayed black, after checking the monitor, graphic card etc etc, I hit the clear CMOS button on the motherboard and it booted up, I got

CMOS Checksum Bad
F1 Run Setup
F2 load default values

If I run setup on reboot I will just get a black screen, I have to load defaluts then the comp will run fine intill I turn it off then I will have to hit the clear CMOS button on the motherboard to get it to boot again. Any ideas or suggestions? Thanks for any help.