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My raspberry pi will boot fine and I can access via SSH however when connected to HDMI it is just a black screen that appears. I notice that the display screen resolutions are alternating back and forth from 1024x768 to 640x480 and is in a loop of doing that.

Green light for SD is on and red light is on as well. I can access files and run scripts... just HDMI acting strange.

Advice is welcomed. Thank you

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    Have you tried running sudo raspi-config via ssh and setting a default resolution to match the monitor? It should be in advanced options - raspberrypi.org/documentation/configuration/raspi-config.md and a reboot is needed. If no go try adding hdmi_ignore_edid=0xa5000080 to config.txt and reboot again.
    – user115418
    Oct 18, 2020 at 15:42

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I had a similar problem. My first Raspberry Pi, brand new, would not boot. Went through all the hoops of not booting RPi4B 8GB to finally trip over this link: https://github.com/raspberrypi/firmware/issues/1232

What did it for me was commenting out the dtoverlay line close to the bottom in the config.txt file

# Enable DRM VC4 V3D driver
dtoverlay=vc4-kms-v3d

to

# Enable DRM VC4 V3D driver
#dtoverlay=vc4-kms-v3d

You might have fkms instead of kms. No difference, just comment out the line you have in your config.txt

Hopefully it will work as well for you as it did for me.

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