HP not turning on

The following beep codes are common to many HP and Compaq desktop computers. Use these codes before referring to the other codes when they occur.
Beeps Description 1 short beep and 1 long beep Memory problem 2 short beeps and 1 long beep (repeats 5 times) Unable to initialize video or video card required but not installed 3 short beeps and 1 long beep CPU configuration error or CPU type is not compatible The following beep codes are common to many HP and Compaq desktop computers that can occurwhile restoring, flashing or updating the BIOS :
Beeps Description 1 short beep Legacy floppy drive or CD/DVD drive not detected 2 short beeps Floppy diskette or compact disc not detected 3 short beeps Unable to start flashing (such as when missing a utility or BIOS image) 4 short beeps Flashing failed (checksum error, corrupted image, etc.) 5 short beeps BIOS recovery successful
You can refer to the link mentioned below for further troubleshooting:
http://h10025.www1.hp.com/ewfrf/wc/document?cc=us&lc=en&docname=bph07107#N589

GuruAid

Hi, Do this beeping code for motherboard troubleshooting. First disconnect all memory,external video card, etc only motherboard and power supply. Then power on if you hear continuous beeping means the motherboard working good. Please do this beeping code troubleshooting.
No beeping means Short, No power, Bad CPU/MB, Loose Peripherals. One beeping means Everything is normal and Computer posted fine. Two beeping means POST/CMOS Error. One Long Beep, One Short Beep means Motherboard Problem.
One Long Beep, Two Short Beeps means Video Problem.
One Long Beep, Three Short Beeps means Video problem.
Repeated Long Beeps means memory error.
Continuous Hi-Lo Beeps means CPU Overheating.

1 short beep and 1 long beep Memory problem 2 short beeps and 1 long beep (repeats 5 times) Unable to initialize video or video card required but not installed 3 short beeps and 1 long beep CPU configuration error or CPU type is not compatible The following beep codes are common to many HP and Compaq desktop computers that can occur while restoring, flashing or updating the BIOS : Beeps Description 1 short beep Legacy floppy drive or CD/DVD drive not detected 2 short beeps Floppy diskette or compact disc not detected 3 short beeps Unable to start flashing (such as when missing a utility or BIOS image) 4 short beeps Flashing failed (checksum error, corrupted image, etc.) 5 short beeps BIOS recovery successful

Disconnect all devices from the power supply EXCEPT the motherboard
Remove any extra cards including video etc.(plug monitor into the onboard)

If you hear any beeps these can indictate where the fault is.
either of these sites below will help you further with that

Beep codes Pc

More beep codes

Power up the pc and see if the fans are working.
If not then double check the power connections to the board.

If you still have no fans it is time to suspect the power supply as the probable cause.

If the fans worked then you should have gotten a display which told you there was an error and offering you a chance to go into the BIOS. ignore it and shut down the PC.

Now connect one drive only and boot again.

Repeat that until you identify the component that is giving you a problem.

Once you find the problem then remove or disconnect and carry on with the rest to see if another component might also cause a problem

If there is only one problem device then you may want to investigate that device further, Unless you don't mind replacing it
Hope this gives you the information you need

Hope this gives you the information you need

Bob
Moderator

It would be very decent of you to consider the quality of our experts answers and judge them accordingly as you pass through FixYa.

Thank you

how many times it beeps is an indication of the problem
1 short beep
Normal POST - system is ok 2 short beeps POST Error - error code shown on screen No beep Power supply or system board problem Continuous beep Power supply, system board, or keyboard problem Repeating short beeps Power supply or system board problem 1 long, 1 short beep System board problem 1 long, 2 short beeps Display adapter problem (MDA, CGA) 1 long, 3 short beeps Enhanced Graphics Adapter (EGA) 3 long beeps 3270 keyboard cardhope this helps.

I went to google and it seems like the beeps can be problems for different problems in the hardware, this is what one message says,  there are lots of computer beeping answers out there: 1 short beep is your BIOS saying "HELLO I'M OK" 

Standard Original IBM POST Error Codes 

1 short beep Normal POST - system is ok 
2 short beeps POST Error - error code shown on screen 
No beep Power supply or system board problem 
Continuous beep Power supply, system board, or keyboard problem 
Repeating short beeps Power supply or system board problem 
1 long, 1 short beep System board problem 
1 long, 2 short beeps Display adapter problem (MDA, CGA) 
1 long, 3 short beeps Enhanced Graphics Adapter (EGA) 
3 long beeps keyboard card 

Each BIOS company has modified these codes over the years.

1 short beep
Normal POST - system is ok 2 short beeps POST Error - error code shown on screen No beep Power supply or system board problem Continuous beep Power supply, system board, or keyboard problem Repeating short beeps Power supply or system board problem 1 long, 1 short beep System board problem 1 long, 2 short beeps Display adapter problem (MDA, CGA) 1 long, 3 short beeps Enhanced Graphics Adapter (EGA) 3 long beeps 3270 keyboard card

HP P4B-MX is Award Bios


Award and Phoenix BIOS:

1 short beep: Normal
2 short beeps: CMOS error
1 long and 1 short beep: DRAM error
1 long and 2 short beeps: Video card error
1 long and 3 short beeps: Keyboard error, or video card error
1 long and 9 short beeps: ROM error
Long continuous beeps: DRAM not installed correctly, bad memory, or incompatable
Short continuous beeps: Bad power supply

No Beeps
No Power, Loose Card, or Short.
1 Short Beep
Normal POST, computer is ok.
2 Short Beep
POST error, review screen for error code.
Continuous Beep
No Power, Loose Card, or Short.
Repeating Short Beep
No Power, Loose Card, or Short.
One Long and one Short Beep
Motherboard issue.
One Long and Two Short Beeps
Video (Mono/CGA Display Circuitry) issue.
One Long and Three Short Beeps.
Video (EGA) Display Circuitry.
Three Long Beeps
Keyboard / Keyboard card error.
One Beep, Blank or Incorrect Display
Video Display Circuitry.

Standard Original IBM POST Error Codes
Code Description
1 short beep System is OK
2 short beeps POST Error - error code shown on screen No beep Power supply or system board problem Continuous beep Power supply, system board, or keyboard problem Repeating short beeps Power supply or system board problem
1 long, 1 short beep System board problem
1 long, 2 short beeps Display adapter problem (MDA, CGA)
1 long, 3 short beeps Display adapter problem (EGA)
3 long beeps 3270 keyboard card

For more info go here: http://pulonangka.web.id/software/beep-codes-error-codes