Epson EL 486UC - Manual (Page 104)

The Computer Will Not Start
The power light is on, but the computer does not start.
Replace your main operating system diskette and turn on the
computer again.
Caution
If you turn off the computer, always wait at least 20 seconds
before turning it back on. This prevents damage to the
computer’s electrical circuitry.
The computer does not start and the power light is not lit.
Make sure the power cord is securely connected to both the AC
inlet on the back panel and an electrical outlet.
The power cord is secure/y connected, but the computer
still does not start.
Check the electrical outlet for power. Turn off your computer
and unplug the power cord. Plug a lamp into the outlet and
turn it on.
If you have an Epson-supplied 80MB, 120MB, or 170MB hard
disk drive installed, make sure you set the
Shadow BIOS ROM
option to
WP-Shadow
or
Cacheable.
Troubleshooting 6-3