Hdmi No signal after Loading windows

So I've been having this problem for almost a month now and I've really just been putting up with it. So when I start my computer it works fine until after "loading windows" the screen goes black then the monitor says it doesn't have an hdmi signal. But after I restart my computer and tell it to run windows normally, everything runs fine, I get pass the "loading windows" and am able to logon and use my computer endlessly. This happens everytime I want to use my computer. Thanks for any help in advance. If I can't fix it myself I'll find some one to fix it in town.

AMD Radeon Sapphire r9 280x
CPu intel core I5 4460 3.2ghz
8 GB ram
Psu corsair 600w
MB: msi military class 4
I have windows 7 ultimate 64-bit