Hp Omnia 200-5000 led on, no signs of life

[iomare]

I am trying to fix an Omnia AIO computer. When push the power button the led comes on and the larger fan starts working.

The smaller fan starts for one secon and then stops. The led on motherboard is on and there are no flashing leds or beeps. The hard disk spins and keeps on spinning, but doesn't seem to be reading. After leaving on for some time and press power button, the computer stays on and have to keep power button pressed to turn off, so presume that it is not booting into OS. The usb ports give power to mouse and keyboard. Nothing on screen. 

Tried different power supply

Tried different Hard Disk

Tried removing RAM, no beeps or flashing leds

Tried the guides from Hp 

Anyone whom can help. I think could be motherboard.

Thank you,

David

[Riddle_Decipher · Accepted solution]

@iomare

Thank you for posting on HP Forums,

The Riddle_Decipher is at your service.

As I Understand there is no video on the screen though the AIO powers on,

Don't worry as I have a few steps to help resolve your concern:

Remove any media from the floppy drives, CD/DVD drives, USB ports, and memory card reader slots, and disconnect all non-essential devices (printers, scanners, external hard drives, and similar). Leave only the keyboard and mouse connected to the computer.

With the devices disconnected, restart the computer. If the screen now displays a picture and Windows starts properly, a device is preventing the computer from starting. See Updating the BIOS to resolve this issue.

If the screen does not display a picture or Windows does not start properly, follow these steps to resolve the issue:

Step 1: Performing a hard reset to resolve a blank screen issue

Completely resetting the computer can resolve many issues that cause a blank screen. Follow these steps to perform a hard reset:

1. Turn off the computer.

2. Disconnect all peripheral devices and remove all USB devices and media cards.

3. Disconnect the AC power adapter.

4. Press and hold the power button for at least 15 seconds.

5. Reconnect the AC power adapter.

6. Turn on the computer.

For more steps and guidance: Click here

You've not made any hardware changes on the computer before this issue occurred, have you?

Keep me posted,

If the information I've provided was helpful, 

Give us some reinforcement by clicking the solution and kudos buttons, 

That'll help us and others see that we've got the answers!

Good Luck.

[iomare]

Hi Riddle_Decipher,

Thank-you for your response. 

I tried the steps you provided before dismantling the whole PC. Removed all parts eccept the CPU and tried in every way to get it to work. Without RAM, no beeping sounds or anything else. Hard disk always spinning up. As mentioned before I even tried different power supply, attaching a different screen to internals etc... In the end I decided it must be the motherboard.

So I reassembled the whole computer and after coming back to it, nearly magically it started up. Now it starts every time. Tried to leave it disconnected for a night, this morning started right up again. I must say that during disassembly at each step I tried booting it up and nothing seemed to work. Reseating RAM, reseating cables etc... . 

I ran diagnostics and RAM, CPU, GPU, HDD all seem in the norm during stress test. Tried recreating the problem, but nothing got it not working again. I am glad it is working again, however since I fix lots of computers it nags my mind what the actual problem could have been.

Anyway, thanks again and have a great day,

David,

Italy

[Chimney_83]

Thanks for the reply and trying the suggested steps. Glad to hear that the computer is working fine now. Probably could be the RAM not getting detected correctly. 

Please do post on our forums for any technical assistance. 

If the information I've provided was helpful,

Please give us some reinforcement by clicking the "Accepted Solution" and "Kudos" buttons,

That’ll help us and others see that we’ve got the answers!

Good Luck.