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HP Probook 450 G4 - 2 long beeps and 2 short beeps on start-up.

Pay close attention to the number of beeps, if the beeps are long or short (or all the same length), and if the beeping repeats or not. Generally this is caused by a memory chip that is not seated properly.

I've replaced the power supply - pulled all cables from the motherboard - reseated one by one - but still get the beeps.

One such instance is 3 long beeps and 4 short beeps that often occur in the Hp systems.

Hp post beep codes 3 long 4 short Hi there to the HP Support Forums! It is a great place to find the help you need, from other users, HP experts and other support personnel.