Blackscreen on MacBook Pro M1 Max 16‘‘ but external display works

Hi,

the title says it all. I saw a glitchy pixel line at the top flickering a few seconds before the screen was just black. All i have as a second screen is a laggy tv. I obviously restarted already and installed the latest macOS update. I use tools like BetterTouchTool, Alfred and Bartender, if that may cause an issue maybe (?)

It happened after I transported it in a backpack. But this can only be a coincidence, because the laptop is well protected in a special compartmant and i have nothing inside the pack that could pressure damage the display or something. The case itself also doesnt show any signs of cracks, scratches, dents, bents or anything.

The battery is also fully charged and I have never used any third party method to charge it.

During the macOS update the tv got no signal but you could see a very dark and very blurry image of the apple and the progress bar.

Using my iPad in sidecar mode froze the image on the ipad after 1 or 2 minutes. The tv signal was solid though as long as i didnt restart or pressed the power button or something.

In the sea of outdated articles I tried a few things but every restart or long press of the power button results in no signal on the tv. so its very hard and frustrating to not see anything at all.

i dont know what long pressing the power (touch id) button does, though… as i cant seeee it :D

Ive read a lot that this is more often a software issue than a hardware issue and would like to avoid sending it in.

Since I’ve had very good experiences in this forum already, I hope you guys will rescue me once again :(

Thanks!