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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