An HP OmniBook Ultra 14 that will not turn on is covered by HP's own guide for a laptop that does not start and by several HP Support Community threads, and the advice runs in a clear order. First prove whether it is dead or only dark: listen for fan noise or a click near the vents, press a key to see whether the keyboard backlight lights, and plug an external monitor into a USB-C port; a picture there means the laptop is running and the internal display or its connection is at fault. Then the hard reset: disconnect the AC adapter and every accessory, hold the power button for fifteen to twenty seconds, reconnect the original adapter and press power.
Use the adapter that came with the laptop, since the OmniBook needs a USB-C charger with enough wattage and a weak one does not wake a flat battery. If it still does nothing, HP's BIOS recovery combination, holding Windows plus B and pressing the power button for three to five seconds, may open the BIOS recovery screen. If the laptop shows a blue screen or a recovery message, see the start-up and recovery page. HP's own support site has a Support Assistant that cannot run on a dead laptop, but HP's phone or chat support can use the product number from the underside to confirm the warranty, so have it ready.
If the laptop is within warranty, a repair is free, so do not attempt risky workarounds that could void it.
Differential
Likely causes of “HP OmniBook Ultra 14 will not turn on or start”, and how to tell them apart
- 1
A weak or wrong USB-C charger
What separates it No charging light and no response
How to confirm Use the original adapter in a wall outlet
- 2
A hung power state
What separates it No lights or fans
How to confirm Disconnect everything, hold power fifteen to twenty seconds, reconnect
- 3
A display fault with the machine running
What separates it Fans or backlight respond but the screen is dark
How to confirm Test an external monitor on USB-C
- 4
A corrupted BIOS
What separates it It does nothing or loops at the logo
How to confirm Windows plus B with the power button for BIOS recovery
- 5
A board or battery fault
What separates it Nothing works after the steps
How to confirm Contact HP support
Before you touch a setting
Record this first — changing settings destroys the evidence
- Whether fans, backlight or any light respond
- The adapter used and its wattage
- Whether an external monitor shows a picture
- The product number from the underside
Try in this order
0 of 8 completedCheck for signs of life
ReversibleListen at the vents, press a key to see the backlight and look at the charge light.
Test an external monitor
ReversibleConnect a screen to a USB-C port; a picture means the laptop is running.
Do the hard reset
ReversibleDisconnect the adapter and accessories, hold power for fifteen to twenty seconds, then reconnect the original adapter.
Charge for thirty minutes
ReversibleLeave it on the original adapter before pressing power.
Try BIOS recovery
ReversibleHold Windows plus B, press power for three to five seconds, release power and keep holding the keys.
Contact HP support
ReversibleIf nothing responds, with the product number ready.
Have the product number ready
ReversibleFind it on the underside label before you contact HP.
Check the warranty
ReversibleConfirm the warranty status on HP's site.
Model-specific
What is true of this model and not of its siblings
- Dark versus dead
- An external monitor settles which it is.
- BIOS recovery
- HP's key combination can restore a corrupted BIOS.
- Charger wattage
- A low-power USB-C charger may not wake a flat battery.
- Warranty
- A repair is free in warranty.
- Product number
- HP support needs it.
Stop boundary
When this stops being a self-service repair
- !If nothing responds on the original adapter after a hard reset, contact HP support
- !If an external monitor works and the panel does not, book display service
- !A burning smell means unplug it
Evidence ledger
Sources behind this answer
An OmniBook Ultra owner's no-power report and replies.
Another OmniBook that will not start and the reset steps suggested.
Checks for a dead OmniBook.
Exact questions
Common questions
Why won't my HP OmniBook Ultra turn on?+
A weak charger, a hung power state or a display fault.
What is the Windows plus B recovery?+
A key combination that can open the BIOS recovery screen.
How do I tell if the laptop is on?+
Listen for the fan and test an external monitor.
Which charger does it need?+
The original USB-C adapter.
Will opening the laptop void the warranty?+
It can, so ask HP.
Where is the product number?+
On the underside label.