Unable to boot

Hi All. I have been trying for a week to get my Raspberry Pi 5 to boot. I have tried two SD-Cards and a USB thumb drive to no avail. If I use the custom config option in Raspberry Pi Imager, I get a screen that says its generating SSH keys and then it says rebooting, but it never comes back. If I pull the power and plug it in, I get the standard linux boot text scrolling for a few pages and then the screen goes blank, it never seems to connect to wifi using the custom config, and the keyboard has no power. The led stays red forever more. I have tried all of the options in config.txt for hdmi, plus the video= option in cmdline.txt and nothing changes. I have tried Raspberry Pi OS 64bit, Ubuntu, and Kali and all do the same thing. The last item I have seen come up a few times before it goes to black is "BCM: Using default device address". Although it does seem to go black at different points, so I'm not sure if thats useful. I am honestly at my wits end trying to get this working. Any assistance would be really grateful

Do a warranty claim.

Under what pretence? If I am getting video output while it's booting and the output shows that the OS is loading, doesn't that show that the pi is working?

do you have another pi by any chance? if it works in that pi then yeah do a warranty claim

If the screen goes black but the Pi is not rebooting by itself, try it on another display. Might be some issue with the video resolution. Have you tried Pi OS Lite?

Yeah, I tried it on my PC monitor and my TV. I also tried the full OS and the lite OS.

If I use the full OS it boots all the way to the desktop and then the screen goes black 3 seconds later

I only have an original Raspberry Pi Model B from 2011, so I'm not sure that's a good comparison

what does it do with lite?

What! You have stated a "Raspberry Pi 5" above.

He means he has both pi5 and original pi

Or i think so

Yes, sorry, that's what I meant. I have a Pi and a Pi5

Once the screen goes black the lights stays solid red

The original Pi takes a loooooong time to boot

I have one original Pi running in my network 😉