Clevo pc70dr black screen no display.

I brought it on holiday and It had a broken gpu fan and i continued to use it on games that arent demanding (with a fan pad under it). I monitored the temps frequently and it was working with no problems. After I had flew back home I opened it up and replaced the gpu and cpu fans with ones that had the same part numbers, And now it refuses to display anything even if I plug it into a separate monitor