Beeps,
CPU or Keyboard Lights, or POST error messages.
Caution: Power is continuous to the system board and power supply even when the power switch is turned off. To prevent damage to the unit, disconnect the power cord from the power source or the unit before beginning disassembly procedures.
Power LED has no color showing. Computer is off.
Power LED glows green. Computer is on.
Power LED blinks green 1x/second. Normal suspend mode.
Power LED glows red. CPU not installed/fetching code.
Power LED blinks red 4x/second. CPU thermal shutdown.
Power LED blinks red 1x/two or more seconds. Power supply crow bar.
Power and hard drive LEDs glow red. Riser board not seated.
Num Lock LED flashing green. Memory error.
Caps Lock LED flashing green. No video.
Scroll Lock LED flashing green. System board failure, prior to video.
Audible. 1L 3S. System ROM is bad; system is running in FailSafe Boot Block Mode.
Audible. 2S.
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Notes: Short (S) and long (L) beeps will only be heard if the system has a speaker.
LEDs will only function on PS/2 keyboards, not USB.
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