I just picked an Apple IIgs (ROM3) w/ keyboard, mouse, monitor, and 2
drives (3.5” and 5.25”) at no cost expect shipping.   I connected up the
system, powered it on, and it appears to work.  BTW, nothing in the
slots.  This is my first IIgs, so please bear with me.

My first question is, “now what?”  Other than a good cleaning (esp. the
keyboard) is there any preemptive maintenance I should perform before
heavy (or occasional) use?  Anything I should check?  What about a diag
disk?

I am not interested in any intensive restoration work.  The system is
dust free (and came with a dust cover too :-) and was probably packed
away for sometime.  I cannot tell if there is any discoloration.  It is
mostly clean except the keyboard.  What solvent should I use to safely
remove the grime?

My only concern at this point is that when I (cold) power on the
monitor, I hear a loud “thunk”, however the monitor output looks normal,
except that it can start to look messed up if I adjust the horizontal
placement.

That’s it.  Thanks.