If you suspect that only the screen is not working, you can still get a cue as to whether the rest of the machine is up and running or not.
When you first power it on, BASIC is the highlighted option on the menu, so just pressing <ENTER> will get you into BASIC, and at the command prompt. Type in BEEP, followed by <ENTER>. If the rest of the machine is working, you’ll hear the sound. That might help point you in the right direction. —Justin
