Now treat me gently, I'm already a brusied noob! I thought I was "reasonably" OK with computers, having built my own 8 bit 4K (yes, 4000 bytes) computer a few [ahem] years back, and am not afraid to dive into PCs. And yes, I grew up on DOS, so some basic text commands on the Pi had me in tears (of nostaglia). Never been a Unix guy, tho. Never needed it!
New Raspberry Pi 3, set up with everything set as defaults. I've had it working fine, written HelloWorld Python3 program and flashed an LED, etc., through the gui on an HDMI screen. I can even talk to the Pi via SSH on my PC. All good.
Then this evening, the GUI screen goes fully black after a reboot, BUT the mouse pointer is still there, and still moves. Nothing else on screen. Same results with two different monitors. I can Ctrl/Alt/F3 to another login, or get in via SSH, so the Pi is alive and well, and the monitor is OK, too. It's just the damn blank GUI!
I did make some changes to the Config file, trying to fill the screen better, but I'm pretty sure I put all that back (mostly commented the options out). Where to from here - any ideas? I did look about, found references to (utterly) blank GUI screens, but I don't think that's where I am with this one.