Computer turning on then off instantly

[MLG Sloth]

I took my existing dell Inspiron 3847 and put a gtx 1050 it in it and an evga 500w psu then put it all in a corsair spec 02. I then tried to turn it on and it turned on then immediately turned off. Someone please help I don't know what to do.

 

[Multipack]

Check this guide closely first. It covers pretty much everything http://www.tomshardware.co.uk/forum/261145-31-perform-steps-posting-post-boot-video-problems