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HP Recommended
HP z440
Other

Help my workstation, HP z440, wont show anything in screen. Before that it boot it up and I could access the BIOS. I changed some settings in the BIOS.The error then was the 6 beeps and I fixed it by pressing the CMOS button for 5 seconds. Now the computer does not beep, but it does even show anything on screen (no booting or even displaying the logo of HP), it is just a black screen. Moreover, when I now power on the computer, it create static noises and it seems that motherboard does not give any external power (like mouse and keyboard wont work, but the internal fans of the computer (CPU fans and video card's fan turn on). I need help, I don't what to do to fix this.

 

My computer has 8 GB of ram, no hard drives and 700W power supply. The video card is the one that came preinstalled in the computer, 

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