PC shutdowns randomly, no warning. But its still kinda running

mORTcube

Honorable
Dec 27, 2013
16
0
10,510
Hello to everyone,
So to my problem, as I said in the title, my pc shuts down completely randomly, it doesnt matter what am I doing. But its not completely off, the power button on the case is still lighting. The monitor just blacks out and you can hear a noise of a fan inside a computer, it sounds like it stops spinning for a half of a second and then its starts spinning again.
The only thing what I can do is either unplug the whole system or just hold the power button for a few secs.
I already searched for the problem on the internet and a lot of people says its either bad power supply, overheating or even a bad keyboard (if its PS2, which mine is).
I already checked for the overheating and i can confirm that its not the problem. My temps are actually pretty good.
Its probably the power supply as it is the oldest part of my computer (9 years old) but I just want to make sure that i wont spend a lot of money on a power supply and the problem wont disappear.
Thanks to all of you who read it all the way here, also Im so sorry for any grammatical mistakes, still learning your language :)

My rig: ASRock 960GC-GS FX
FX 6300 3.50 GHz
Corsair 1x8GB DDR3 1600Mhz
450W PSU Not sure about the Brand :)
MSI HD 7790 1GB GDDR5 OC edition 1200/1600Mhz
 

mORTcube

Honorable
Dec 27, 2013
16
0
10,510
Also, if im going to buy a new power supply. Is there going to be problem with connecting hard drives? Because right now I have 2 old IDE drives and the new power supply wont have any IDE connectors?
 

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