Desktop All in One won't power on

[REIROF]

My 27-a210 Won't power on. The ac supply is working but the little light  above where it plugs into the back does not light up  either, does not do anything!

[Elohi_NR · Accepted solution]

Hi @REIROF,

Welcome to the HP Support Community. 

I understand that your Desktop not powering on. I'd like to help!

Have you attempted any steps on your own before posting on the community forums? 

When was the last time it worked without these issues? Did you install/interrupt any updates recently?

While you respond to that, here's what you need to do:

Step 1: Remove discs and devices before troubleshooting startup issues

Turn off the computer, remove any discs and USB devices, then remove memory cards from the card reader slot. Disconnect all non-essential devices such as printers, scanners, external hard drives, and similar devices. Remove or disconnect all discs and devices from the computer, except for the mouse, keyboard, and monitor.

After you have removed all discs and devices, turn on the computer. What happens?

If the computer starts, reconnect devices one at a time and restart the computer to figure out which disc or device is causing the problem. You are done.

If the computer still does not start and exhibits the same problem, press and hold the power button to turn off the computer. Do not connect anything and continue troubleshooting.

Step 2: Perform a hard reset

Many startup errors and other problems can be resolved by decreasing the amount of power stored in hardware components. Decreasing stored power is sometimes referred to as a "Hard Reset." Use the following steps to perform a hard reset on a computer:

Turn off the computer completely; disconnect the power cord from the back of the computer.

With the power off and the power cord disconnected, press the power button on the computer for 5 seconds. The power light indicator on or near the power button might turn on briefly but then go out.

Reconnect the power cord and turn on the power.

If the computer starts, you are done.

If the computer still does not start and exhibits the same problem, Then it could be a hardware issue.

Hope this helps! Keep me posted for further assistance.

Please click “Accepted Solution” if you feel my post solved your issue, it will help others find the solution. Click the “Kudos/Thumbs Up" on the bottom right to say “Thanks” for helping!

[REIROF]

I connected a power supply from another HP All In One and it booted on. I powered it off and connected it to the supply for the 27-a21 and it works, been working ever since. I did try the steps you suggested but nothing happened, the power light in the rear never lit. Thanks for replying!

[Elohi_NR]

Hi @REIROF,

Thanks, it's my pleasure. I am happy to know that, it's working now. Do keep us posted if anything in the future. Take care