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If I press the power button, nothing happens...
I have to unplug the PS3 from the power source to get it working again and turned it on.

Overview
I have two PS3s, one which is a normal, original piece of kit. The other one is a jailbroken PS3.
But it always turns off. There are a couple of reason why this might be happening.
It could be thermal paste, power supply unit or its bricked because of bad spoofing...
You could say I'm new to modding, and you can't be more right.

English isn't my first language, so if there anything you need to clean up on, give a response.

Spoofing
I was on 4.55 Rogero CEX which was spoofed on 4.60. I disabled it and removed it from my PS3.
When It asked me if I should HARD reboot or SOFT reboot, I went with the HARD reboot.
And someone said it's because of that this is happening. This is a very good reason.
Spoof I have now and had before (Same Author):
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Power Supply Unit (PSU)
I don't have the original PSU, and after looking a bit on the internet on issues, I came to a conclusion.
This PSU I have now, it's pretty crap, without even a brand. In the tests I did, I got results if it's this of not.

Thermal Paste
When I got my PS3 it worked perfectly.
It was after about 3-5 months after the purchase and jailbreak, this happened.
I got my PS3 from Ebay. From this dude, check out the whole Ebay page for reference!
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Unfortunately this also ties in perfectly with the Spoofing error date which more seems more like the problem.

Test Results
Treat this as a time line for more understandable usage!
From another post, I grabbed this info:
"Temperature 71C and RSX temperature 74C." - Max
"Temperature 62C and RSX temperature 63C." - Mid

TURNING ON PS3 FROM 2 DAYS!

Normal Session
(No hacks turned on but temp checks)
Game = MW3 // Playing Matches
10mins = 57/58 Celsius
15mins = DEAD

XMB Session
(No hacks turned on but temp checks)
Game = XMB // Main Screen
1min = 59/57 Celsius
2mins = DEAD

GIVING PS3 TIME TO COOL DOWN!

XMB Session w/ other power cord
(No hacks turned on but temp checks)
Game = XMB // Main Screen
6min = 55/54 Celsius
10mins = 57/58 Celsius
13mins = DEAD

GIVING PS3 TIME TO COOL DOWN!

XMB Session
(REMOVED THE SPOOF HOW IT SHOULD BE)
(GIVING IT A SOFT REBOOT)
Game = XMB // Main Screen
I have disabled the spoof from the package. The PS3 said it's on Rogero 4.55!
Which is the Rogero I first had installed on it! And turned the PS3 off as soon I was done.
Around 4-6mins finish time of the spoof removal.

XMB Session after spoof removal!
(REMOVED THE SPOOF/now on 4.55 Rogero)
Game = MW3 // Playing Matches
I have turned on the PS3 and waited for the shutdown.
6mins = DEAD

GIVING PS3 TIME TO COOL DOWN!

Recovery Mode
(It still auto-shuts down, even in recovery mode.)
I was in recovery mode doing nothing.
15mins = DEAD

GIVING PS3 TIME TO COOL DOWN!

System Update
(I went intro recovery mode and "system update"ed my rogero 4.55)
(This is an update, not a complete reinstall of the system though.)
Still nothing, same problem
(managed to pull a whole system update)and after 1mins in XMB = DEAD


Conclusion
I have no clue. What do you think...?
We know for sure it's not PSU so either Thermal Paste or the Spoofing error.
If you know how to fix the spoofing error, please let me know.
I'll be replacing the Thermal Paste if someone think that's the problem and give me a good reason behide it.
If you need any other resources or questions answered please give a response.

Remove the cap from your ps3. I had the problem my ps3 won't on. But when i took the cap of it he works fine. Sorry for bad english

Download it again and transfer it to a USB drive. That's all.

Which/what cap is the one that you're talking about?

I think the problem is that the top of the PS3 gives too much pressure and the PS3 will get a short circuit because the boy where you bought your ps3 has done something wrong with the downgrade and now is going on and when that piece of iron has contact with another iron portion pS3 goes completely off . so if you a lot less crowded top loose screw is there and who is not for closure crust . that was my problem with a loose top and it works perfectly. hope helps for you to

Ladies and gents, I managed to pull of a system update. I went on recovery mode and pressed system update and did it to the exact rogero I had. That still didn't do anything good. Not only that but before I unscrewed the whole thing to check dust, and there was nothing, no dust whatsoever. Although I think I put some screws in wrong places but over all, it was fine. But the problem still happend. This however isn't a complete reinstall of the ps3, JUST an update.

Also when it comes to unscrewing ps3s, COME PREPARED. That's the lesson I learn't.

So what do you think I should do?

I really think the problem is short circuit

What should I do about that?