Unreachable fresh image

I’m using a RPi4B, fresh install.

Issue I’m having is that the device becomes inaccessible shortly after boot.

I’m very familiar with dietpi, having used it on my orange pi devices for awhile.

Dug out a raspberry pi 4 B, the issue is that shortly after performing the config after first signin, it becomes inaccessible.

I’m using the official Canakit 5V power supply (actually tried two of them, in case one was going bad).

I just switched to a new microsd card, a Samsung EVO Select, U3, A2, V30 - same specs as the official raspberry pi micro sd so it shouldn’t be a problem. I’d also tried several other cards, including one that worked just find in an orange pi, just didn’t need anymore since I’m booting from an ssd now.

The issue is that I reimage the sd card, set my passwords, update, select the packages I want (just tigervnc server and a desktop environment) and then it becomes inaccessible after 30 minutes or so.

I can hear the fan whirring but it doesn’t even show up on the network. The ethernet cord is definitely good, switched the cords I’ve been using for my main orangepi and it works great with the orangepi.

I more recently tried while plugged into a monitor instead of my usual headless setup. Went exactly the same way, although now I can see that when it boots up, it gets to the signin page but right after it says ‘press return to sign in’ the screen goes blank and I just see a blinking ‘_’ symbol in the upper left hand corner. I’m assuming this is the issue.

I used to have an external hdd plugged in but for troubleshooting, recently I’ve had nothing plugged in but the monitor, keyboard, and power supply.

I used the integrated stress tester to test the cpu and ram for 5 minutes, no issues.

I’ve been an IT guy for the last half decade so I’ve tried pretty much all the troubleshooting I can think of but I’m kind of dead in the water here. Thoughts?