My desktop keeps beeping many times when i turn it on and has a black screen .

[Kyriakos19]

I have recently unplugged all cables and plugged them back again. But i think i have plugged by mistake the HDMI cable to display port . At first the pc worked but i think it was overheated . I switched it off and the next day could not turn it on. It has a black screen and does many beep sounds.

[WAWood]

@Kyriakos19 

First off, I don't see HOW you could have done that, as the connectors for HDMI cables and DisplayPort cables are entirely different.

Second, here is an HP thread describing different beep codes:  HP Desktop PCs - Computer Does Not Start and Emits an LED or Beep Code | HP® Customer Support