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A long beep followed by 3 short beeps indicates that your video adapter's memory has failed. Mylex. As for the Mylex brand of BIOS, 4 beeps means the keyboard or the controller IC on the motherboard has experienced failure. Q & A. Hp 3 long beeps 4 short beeps My son just had the same problem. I had him clean the dust off the processor heat sink. No beeps, boots right up. Hp elitedesk beep codes 3 long 2 short HiFirst:- Turn off the computer, press and hold the PWR button for 4 seconds.Then - Leave only keyboard and mouse connected, disconnect all externally connecteddevices such as Docking Station, USB storage devices, displays, and printers.Unplug the AC adapter from the computer.Next.