Question my pc wont start up and theres power getting to the motherboard

[bullet bob]

i have a asr-rock h61m-hvs core i5 3570 with a gtx 950 8gb ram and im not a computer person but the long plug that powers the motherboard gets hot underneath but thats all that happens when i press power button

 

[punkncat]

Has this system been operational? Did some event occur which resulted in this issue?

Full build specs or model number? Include PSU, please.