black screen no signal

Mar 23, 2018
2
0
20
ok , so this is my rig
i5 4690k
gtx 960
8 gigs hyperx red ram
asus b85m-gamer mobo

Today i turned on my pic , no problems .
I wanted to clean it , just blew the dust out with a airgun(cold air)
put it back on my desk hook it up and i got no signal
tried anything , change the ram slot , took the battery out and everything i knew .
this happend to me once more 1 year ago , send it to warranty and they said there s nothing wrong with it , i had the exact same problem but when it came back it worked