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There are many reasons that a computer does not startup or boot into the Windows operating system. If your computer will not start or boot, you will see or hear symptom to indicate the general area of the problem.
The following table illustrates the meaning of blink codes used on some notebooks with EFI environment. The blink or beep codes on your computer may have different meanings. When you contact HP for support, the agent needs to know the model of your computer and may ask you about blinking LEDs or beeping tones to help troubleshoot a startup problem.
Meaning of Sample Blink Codes for some EFI Notebooks
| Number of Blinks or Beeps | Location of Blinking LEDs | Component Being Checked | Error Condition |
| Continuous glow |
Battery power LED |
Battery |
The AC adapter is attached and the battery is charging, but does not yet have sufficient charge to power the notebook. |
| 1 |
Caps Lock/Num Lock |
CPU |
CPU not functional |
| 2 |
Caps Lock/Num Lock |
BIOS |
BIOS corruption failure |
| 3 |
Caps Lock/Num Lock |
Memory |
Module error not functional |
| 4 |
Caps Lock/Num Lock |
Graphics |
Graphics controller not functional |
| 5 |
Caps Lock/Num Lock |
System board |
General system board failure |
| 6 |
Caps Lock/Num Lock |
BIOS |
BIOS authentication failure |
| Continuous blink |
AC power adapter LED |
Power adapter |
Insufficient power |
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