Hp all in one won’t boot up

[Lauren211]

Hello

The computer will not power up. When plugged in there is a light at the back. As soon as I press the power button the light goes out and nothing happens. The wireless keyboard and mouse is not connected. 
I’ve tried another power cable and it does the same. 

[itsmyname]

@Lauren211 -- possible failure-points:

1. power-supply
2. motherboard
3. processor

if the power-on does not cause any immediate response (fans spinning, lamps lighting-up, et cetera).

Temporarily trying a different power-supply is the least expensive "part-swap".

Changing the motherboard or the processor can be over $300.

It's time to take the computer to a computer technician, for professional trouble-shooting.

[Lauren211]

Thank you for your help. 
The computer is only 8 months old so still under warranty. 
How do I arrange a repair with HP? There is no link or telephone number for the UK. 

[itsmyname]

@Lauren211 -- How do I arrange a repair with HP?

Start at: http://Support.HP.COM and click "Contact Us" to open what HP calls a "case" to exercise the HP Warranty.

On the Locate a service centre near you page, select "United Kingdom", and then select a city.