Just a quick update.
Last week I removed the cover to look around and saw (what I thought) was the cable to a SSD, but it seemed connected in a haphazard way.
Today I powered it for the first time since placing the cover on. The boot up beeping could be heard, however, the screen remained white. Also, although I'm uncertain whether this was the case before, channels 1 and 4 had the 1M and 50ohm illuminated whereas channels 2 and 3 (the "bad" channels) didn't have anything lit.
I'm going to remove the cover and look at the cable that I touched to see if something got disconnected.
Also, as for what the scope displays when taking measurements in 50ohm mode (prior to the white screen issue), channels 2 and 3 (the "bad" channels) display a flat line as if nothing is connected to the inputs. Maybe, but I'm uncertain, the line bounces a bit when something is first connected. When in 1M mode, the channels work fine.
The only questionable anomalies I saw: on all channels, when I select auto measurement, and measure a square wave from a function generator, the horizontal portions of the wave are thick. I think if I take measurements after initial booting, the lines are thinner, but I can't say for sure at the moment. Also, the lease concerning issue, the square wave on the front of the scope (to calibrate the probe) isn't producing a signal.
As for the thicker horizontal lines as stated above, I've never used a high frequency, high sample rate scope, so maybe this is normal for such a scope. I'm use to Tektronix 100MHz scopes.
