random black screen/monitor loses signal on Alienware x51

I have a very strange issue with my x51-r2. I have purchased this machine in july 2014 and fell in love with it immediately. 3 months later, I started having issues booting up, there was a constant beep during initial system check and I posted about it on the forum and got contacted the same day by customer service about it. A technician was sent out the same week and replaced my motherboard and it has been working great ever since. I am now having terrible issues where every so often (completely random) my pc will lose connection to my monitor, it will go black and all the LEDs will keep working on the tower, sometimes I can even hear the sounds but I cannot get the picture to come back on. I have tried using different ports to connect to my monitor, I have tried updating the graphic driver (I am running NVidia 760ti), I even wiped the system and did a clean install windows 10, still no luck.
At this point I am very frustrated, I am assuming I am out of warranty too, my "gaming" pc is rendered useless as I can't even play any games because 2,3 minutes into playing, my screen goes black, displays 'no signal' and the fans in the tower kick it up a notch. I have read about other people with the same rig having similar issues but nobody ever posts about a fix.
I love my pc when it works but this issue is very annoying and I am currently very unhappy with my product. I expected it to last a little longer than 1.5 years, not to mention having to replace the motherboard only 3 months later.
If anyone knows of a fix for this issue, please let me know.

Thank you