Hello guys I got a big issue, I tried restarting my computer but when the monitor was supposed to turn on it said "no signal detected", I look inside my computer, and it seems like all the fans that are supposed to be running, the graphic card's fan is running.
The two fans on the back of my cabinet is running, the Processor's fan is also running, I have a hard time figuring out what the problem is, I tried the monitor on a laptop and there is nothing wrong with the monitor, i also tried another monitor on the computer that has the issue,
and it also says no signal detected. is it the power supply? cause I really hope that's it I'll give you my spec or at least as well as I remember it.
p.s also when I click the front off/on button on the cabinet, after the screen shows no signal detected, to shut it down, it seems to shut the computer down a lot faster then it used to, normally I would have to press it in for a while to for it to completely shut down but not now it seems.
really hope someone can help
need more spec info please ask. 
SPEC
RAM: 8GB
graphic card: Nvidia GTX550Ti 2GB
Processor: Intel Core i5-3570K, 3.40GHz,
Power supply: 550W (its name is LC-POWER ... or something)
Operating system: Win 7
The two fans on the back of my cabinet is running, the Processor's fan is also running, I have a hard time figuring out what the problem is, I tried the monitor on a laptop and there is nothing wrong with the monitor, i also tried another monitor on the computer that has the issue,
and it also says no signal detected. is it the power supply? cause I really hope that's it I'll give you my spec or at least as well as I remember it.
p.s also when I click the front off/on button on the cabinet, after the screen shows no signal detected, to shut it down, it seems to shut the computer down a lot faster then it used to, normally I would have to press it in for a while to for it to completely shut down but not now it seems.
really hope someone can help


SPEC
RAM: 8GB
graphic card: Nvidia GTX550Ti 2GB
Processor: Intel Core i5-3570K, 3.40GHz,
Power supply: 550W (its name is LC-POWER ... or something)
Operating system: Win 7