Keyboard / peripherals not working after cmos reset. Can't enter BIOS

[Deffjm02]

Hello

Yesterday my PC suddenly went to black screen and I couldn't get an image even when I tried to power off/on holding the power button. Here's what I've tried so far:

1. Switched from DVI to HDMI
2. Tried another monitor
3. I tried to access the BIOS menu using Esc, F1 up to F12. Even while holding FN.

Til this point I still had a black screen. However what I noticed is that, my keyboard seemed to register input signal 15 seconds after PC was turned on. Not sure if this could be the reason I couldn't access BIOS.

Today I finally did some online research and found some suggestions I thought might help.

1. I tried resetting the CMOS by replacing the jumper from pos 2-3(default) to 1-2. I waited 10 mins and changed it back again. Still black screen.
2. I tried removing the battery and waited 10 minutes.

But now no peripherals seem to be registered by the PC. The monitors with both DVI and HDMI aren't working nor the mouse or the keyboard.

When I turn the PC on it beeps like 15 times and right now im lost. I hope someone can help me find a fix to this problem. My PC is around 2.5 years old.  Specs listed below.

--

PC SPECS FOR HP Omen 880-075no gaming PC:

Nvidia GTX 1070, 8 GB

AMD Ryzen 7 1700

16 GB DDR4 RAM

Motherboard: Higos - https://support.hp.com/gb-en/document/c05521044 

[Grzwacz]

Greetings,

Welcome to the forum.

I am not a HP employee.

Nice troubleshooting!

I think you have a hardware problem; black screen with no mouse pointer. Do you have any PC fan or LED activity?

Possible causes are the power supply, a component connected to the motherboard, or a peripheral device connected to external I/O, or the motherboard/CPU. CPU failure is very rare.

Reduce the PC to only a monitor. Try to POST.

No POST means you will have to test each component.

This can get expensive as you may need known good replacement parts.

It is sometimes best to have HP Service or a local PC tech find the bad part.

Regards