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Message 1 of 2
Flag Post

HP Probook emits 4 beep codes OR starts for 15 seconds and reboots

HP Recommended
HP Probook 450 G5

Hello everybody,


Hope you could help me finding out what the problem with my Notebook is. 


I have an HP Probook 450 G5 -- 2VQ00ES [personal info remove] which no longer turns on:

I am struggling with this 2 errors:
1. Either the device starts, fan blows and it turns off again after about 15 seconds. Then it starts again.
There is no picture and no backlight. connecting to another monitor with disconnecting the laptop display does not help.
2. Or the device makes 4 beep noises, flashes 2 times at the power button, and the charging socket flashes 9 times (orange), this then repeats itself over and over again. (The drive icon is also constantly on)


There is no hard drive installed, as I would be happy to come to the bios. 

I have already tested with new Ram, changed the BIOS battery, connected to external monitor, reprogrammed BIOS with official bios for my serial number from hp page, removed battery, changed power cable, tried a windows boot USB stick.

So is there any option I could find out what's the problem is. (Last option would be replacing the motherboard and hoping everything works). 


Thank you for your help in advance and kind regards
Daniel Hofer


Level 16
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Message 2 of 2
Flag Post
HP Recommended


First off, connecting to an external monitor, in this situation, is unlikely to do anything because that will not display until you are booting into Windows and the PC is restarting before that happens.


Second, If the CapsLock key is blinking or there is beeping, read this HP information on the likely cause of the hardware failure based on the blinking or beeping patters.

For laptops, this HP thread describes the different blink and beep codes:
To determine the cause with hardware failures, you have to be able run diagnostics. We have no way of accessing your PC from here, so we can not do that for you. You have to do it yourself.

You do this by pressing the Esc key repeatedly when rebooting and then, when the HP Startup Menu appears, selecting Diagnostics (usually F2) and letting it run.

If it is NOT possible to run diagnostics, or if that does not work, then there is NOTHING more you can do by yourself -- and there is NOTHING we can do because we have no way of accessing your PC from here to run diagnostics or repair hardware.

You will need to have the PC physically examined in a service facility by folks that can run their own diagnostics to determine what is wrong with it.

If your PC is still under the original one-year HP warranty, or if you have purchased an extended warranty from HP and this is still valid, then having HP do this is an inexpensive option for you. In that case, you should contact HP Customer Support to see about having it repaired or replaced under warranty.

Here is how you can get in touch with support:
Step 1. Here is the link:
Step 2. Select the product type.
Step 3. Enter the serial number of your device or select let HP detect your product option.
Step 4. Select the country from the drop-down.
Step 5. You should see the HP phone support number or Chat option listed.

If your PC is no longer under warranty, then it will cost you up front to have HP examine your PC. If you want to do that, you will have to contact an HP Repair or Service Center to see if they can examine the PC to determine the cause(s) of the problems, if it can be repaired, and an estimate of the repair costs.

Since you live outside the U.S., here is a link to HP Service Centers, by Country/Region:

If you don't get useful results using the Service Center link, here is the main HP link:

If you can't get assistance from HP, then you will have to seek out a local laptop service facility to have them examine it for you.

Good Luck

I am a volunteer and I do not work for, nor represent, HP
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