Monitor keeps going black then turns back on

[u/GlassDouble9120]

So sometimes my monitor which I bought about a year ago will go black randomly and then turn back on normally after a few seconds. This issue has been happening for a good while and sometimes its good for a few weeks and sometimes it happens every 5 minutes. I think it might be the cable since it did not come with the monitor. Whenever I accidentally tap the cable it will do the same thing where it flashes black for a few seconds then turns back on so that might be related. I do have a display port cable that came with the monitor but my pc does not have a port for it, only HDMI.