Pc will turn on, but nothing responds.

My computer will turn on, but the monitor, keyboard, and mouse do not respond at all. I can't do anything to try and fix It. I booted it once and it tried to do an automatic repair, but then the screen went black and nothing after that. I have tried unplugging everything, and waiting a while, but I still get nothing.
Any help would be greatful.

Hello @klock01,
Welcome to the HP Forums, I hope you enjoy your experience! To help you get the most out of the HP Forums I would like to direct your attention to the HP Forums Guide First Time Here? Learn How to Post and More.
I have read your post on how your desktop computer will power on, but the display is blank and the peripheral devices do not respond. I would be happy to assist you in this matter!
To enable the responsiveness of your mouse and keyboard, as well as the display, I recommend following the steps in this document on Computer Does Not Start (Windows 8).
If the issue persists, please call our technical support at 800-474-6836. If you live outside the US/Canada Region, please click the link below to get the support number for your region.
http://www8.hp.com/us/en/contact-hp/ww-phone-assist.html
I hope this helps!
Regards
MechPilot
I work on behalf of HP
Please click “Accept as Solution ” if you feel my post solved your issue, it will help others find the solution.
Click the “Kudos, Thumbs Up" on the right to say “Thanks” for helping!

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Computer turns on but nothing appears on the screen

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I have had this desktop computer for about 2 years. I usually use it almost daily and turn it off at the end of the day. Every few months or so the computer would turn on but nothing would appear on the screen. I would have to hold the power button to turn it off then turn in on a couple times or wait until the next day and the computer would turn on and everything would appear on the screen and work perfectly. Last week, the computer once again turned on but nothing appeared on the screen, except this time, after a week, the computer will now turn on except there is still nothing appearing on the screen. I no longer hear the fans running, however, I hear everything else running as normal. I have unplugged and re-plugged in all the cords multiple times and still, nothing.
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Kelly, welcome to the forum.
When requesting help you should always include the make/model (i.e. p6-xxxx) of the computer and/or monitor. This information is necessary for us to review the specifications of them.
Signature:
HP TouchPad - 1.2 GHz; 1 GB memory; 32 GB storage; WebOS/CyanogenMod 11(Kit Kat)
HP 10 Plus; Android-Kit Kat; 1.0 GHz Allwinner A31 ARM Cortex A7 Quad Core Processor ; 2GB RAM Memory Long: 2 GB DDR3L SDRAM (1600MHz); 16GB disable eMMC 16GB v4.51
HP Omen; i7-4710QH; 8 GB memory; 256 GB San Disk SSD; Win 8.1
HP Photosmart 7520 AIO
++++++++++++++++++
**Click the Thumbs Up+ to say 'Thanks' and the 'Accept as Solution' if I have solved your problem.**
Intelligence is God given; Wisdom is the sum of our mistakes!
I am not an HP employee.

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Pc will turn on, but nothing responds.

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