Accidently unplugged power, won't boot

[blizzard1337]

So I have had this rig for a couple years now, with minor problems such as replacing corrupted HDD once. But for the last months it has been working fine. While using the computer in a csgo match my new kitten managed to sneak in my room and decided to sprint behind the desk and play in the wires. He had unplugged my power supply cable which resulted in it turning off. So when I fixed it and he left it would start (windows 7) as my tower LEDs would turn on yet keyboard wasn't working, not sure about the mouse since the monitor was displaying no signal. Tried unplugging and basic fixes didn't work any one have any ideas?
TLDR; cat unplugged power cable while in use, computer can turn on yet no monitor signal nor keyboard.
Thanks in advance!

EDIT: so when I turn the computer on the tower has its leds but mouse won't work, keyboard won't work but it has power(num lock and caps lock won't turn the light on the keyboard) monitor won't receive signal from computer.

 

[Guest]

Are you sure it's the only cable he unplugged?

 

[blizzard1337]

No I'm sure it was only the power cable as the monitor just switched to no signal screen. The monitor now says no signal at all if I try to turn it on. *The keyboard flashes if I replug it into the computer but when I turn the computer on the keyboard won't do anything tried pressing numlock Etc to see whether the keyboard light would come nope. I tried to see and switch the input but it would say no signal then go to sleep mode not allowing me to open menu(hp x20led)