PC wont wake up from sleep


Aug 11, 2012
Hello I recently Swapped my case and added a hyper 212 evo Everything works just fine but when i put my computer on sleep after pushing the power button the fans start to blow but the screen wont show up and says no signal so everytime i have to restart the PC and after the restart it says resuming windows and it takes long to startup and the 1st thing that appears is the software keyboard then every windows and the desktop become visible from blank... so whats the problem? i didnt have this problem with my last case i didnt do anything i just swapped the case and added a new CPU cooler with adding 3extra fans on the case (6fans at all) I've read in another discussion that it could be because of the graphic card DVI ports. Could it be?