No Display

[Ez33]

put in an aio cooler but it would not work so I put the stock fan back in and the pc turns on and fans spin but nothing appears on the monitor.

[Echo_Lake]

@Ez33
Thank you for posting on the HP Support Community.

Don't worry as I'll be glad to help, I have a few troubleshooting steps we could try to fix the issue:  

• Press and hold the PWR off button for 4 seconds to force a PWR off.
• Unplug from the wall.
• Press and hold the power button for 15 seconds to complete the reset.

If the issue persists then you need to service the computer. 

Hope this helps! Keep me posted for further assistance.
Please click “Accept as Solution” if you feel my post solved your issue, it will help others find the solution.

[Echo_Lake]

@Ez33

Thank you for posting back. 

I would request you to reach out to our Support and our Support Engineers should be able to check the available service options in order to diagnose the computer physically. HP Support can be reached by clicking on the following link: www.hp.com/contacthp/

Please feel free to contact us here anytime you need any further assistance. Please click “Accept as Solution” if you feel my post solved your issue, it will help others find the solution.