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system beeps when turned on. I get one long beep then silence then one long beep. this just continues and I get nothing else. video connected, mouse connected, keyboard connected. boot system does not start. there is no video so i can't do recovery.
please help.

Edited by dallyx2 because: n/a
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As noted, POST beep patterns commonly point at memory or video issues, but the exact meaning depends on the BIOS/motherboard. Start with the simplest, non-destructive checks (power-reset + reseat/testing of RAM) because they fix the majority of “beep + no video” cases and HP’s desktop diagnostics/KB steer you the same way. (h30434.www3.hp.com)

Try this ordered checklist (power off and unplug first; ground yourself before touching components):

  1. Power-reset: unplug AC, hold power button ~15s, plug back in and try. (lifewire.com)
  2. Remove all non-essential devices (drives, USB, PCI cards). Leave CPU + cooler, one RAM stick (use the primary slot) and onboard video (or the discrete card if no onboard). Power on and note beeps, fans, and front LED.
  3. If still beeping, swap that RAM stick to other slots and try each stick alone — replace/clean contacts if a stick repeatedly fails. Many HP beep patterns map to memory faults on affected models. (uxd.zendesk.com)
  4. If you get different beeps (or video appears) after removing cards/drives, add parts back one at a time to find the culprit.

Because you reported two fans and the front blue LED stopped after the drive swap, check power connections next: ensure the 24-pin ATX and 4/8-pin CPU power plugs are fully seated and SATA/Molex power leads weren’t dislodged; a failing PSU or a loose front-panel connector will kill fans/LEDs even while the board beeps. If possible, try a known-good PSU or test the system outside the case to rule out a short. (techdim.com)

Beep codes differ by BIOS vendor, so if the above doesn’t isolate it, document the exact cadence and consult your model’s service manual or Phoenix/AMI code lists before replacing parts. If the machine is under warranty, stop and contact HP support with the symptoms and any diagnostic IDs. (rigacci.org)

Safety/caution: always unplug power before changing hardware, and avoid forcing connectors. If any test requires swapping PSUs or CPUs and you are unsure, consider a local repair shop.

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Member Avatar for Member #758415

This is a RAM problem. I would take it to HP if it's still in warranty.

Member Avatar for dallyx2

system beeps when turned on. I get one long beep then silence then one long beep. this just continues and I get nothing else. video connected, mouse connected, keyboard connected. boot system does not start. there is no video so i can't do recovery.
please help.

Hi I am going to check the memory but since I wrote the first thread I have exchanged the hard drive and tried booting the system, but still nothing on screen accept the no video message. There is power to the keyboard on booting (keyboard lights flash). The beep was still there. All fans working.

I then changed the hard drives back and the long beep had stopped two of the three fans have also stopped working and the blue light on the front of the system is no longer working.
Although there is no beep as you can see I have now got other problems.

Any idea.

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