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Troubleshooting Symptom Charts/Power - 5
Screen is blank;
backlight isn’t on;
computer doesn’t
respond
1 If sleep LED is continually on, backup battery power has been
interrupted. Restart computer by holding down Shift-FN-
Control and power on key. Wait 5 seconds and press power on
key. If computer doesn’t restart, repeat 3–4 times.
2 Restart computer.
3 Disconnect power adapter, remove battery, and restart
computer in 3-4 minutes.
4 Check power adapter cable.
5 Try known–good, charged battery.
6 Try known-good power adapter.
7 Disconnect backup battery for 2 minutes.
8 Check all I/O logic board cables and connections.
9 Replace sound card.
10 Replace microprocessor board.
11 Replace power supply card.
12 Replace PMU card.
13 Replace I/O logic board.