So recently i assembled and am using a new computer, using my two old 144hz monitors alongside it. Due to the graphics card i bought not having VGA output, i had to get a DisplayPort/HDMI capable of 144hz. And so i went out and bought a 144hz DisplayPort cable from Mission SG. It worked perfectly until today, when my computer started acting weird, slowing down mouse movement and other processes on the computer until it completely froze and stopped displaying anything on the monitors, at which point i restarted the computer. However when restarting the pc, the monitor connected with my new cable, or any DisplayPort cable for that matter, wont display anything, exept for "no source found", However still works when connecting with HDMI. my other monitor works fine with this cable, also at 144hz. ever since this happened my computer has also been getting random 0.5 second blackscreens for no apparent reason. I am beyond confused at this point, wondering why one monitor works fine with all the different cables i've tried, and one only has problems with DisplayPort specifically. It's been working fine for several weeks up to this point. pls help