Catalina, fresh install, can only run in safe mode

Hi,

I’ve just bought a 2017 21” retina imac, and ever since I reinstalled it it’s always been rather unstable : restarting without warning, not waking up.

The reports said kernel panic and something apparently related to the gpu (but that’s according to one forum). I’m very sorry I did not write the log down. Once, I had some very odd glitches (red squares on the browsers, glitchy dock and menu)

I tried hooking up a eGpu to offload the internal GPU, but no change.

But I figured it was maybe, because I installed too many things at once and started fresh.

However, now, after it started properly 1/3 of the time, it decided to not start at all, unless in safe mode.

I’ve had several weird glitches : half the apple showing (sometimes the other half was yellow or pink, most of the time invisible)

So…here we are I can now only run my mac in safe mode, and despite being slow and safari having dark grey tab titles, it works fine.

Advanced diagnosis and HDD tools yield no error.

I’m willing to try anything, but know I feel a bit helpless

Thanks a ton in advance