I've never heard of a power supply that automatically shuts itself off when a component is faulty or disconnected. That doesn't make any sense. You wouldn't be able to repair a computer if it wouldn't even turn on. That's what beep codes are for. You wouldn't be able to hear the beep codes if the computer wouldn't turn on. Even if it did turn on and it was just the fan that wasn't working, that wouldn't make any sense either. You need to be able to turn it on and diagnose the problem in order to fix it. I would still bring it into the shop and tell them that it just stopped working but started again for some reason. Demand a replacement.
Well, I can't explain it much better. Somehow, plugging in a new graphics card got it working again.
Can you give a proper explanation of some kind?
EDIT: Here we go! This is the power supply I currently hold:

This is one of the better 500-watt power supplies on the market. (But boy was I ripped off. I paid $100.00 and this website is selling it for about half that? What a rip! :angry:)
Now, here's the Specifications on it:
ModelBrand XCLIO
Model GOODPOWER 500W
SpecType ATX
Maximum Power 500W
Fans 1 x 12cm ball bearing fan
PFC No
Main Connector 20+4Pin
+12V Rails 2
PCI-E Connectors 2 x 6Pin
CrossFire Ready
SLI Certified
Modular No
Power Good Signal 100-500ms
Hold-up Time >20ms at full load, nominal line
Efficiency >70% at full load, nominal line
Over Voltage Protection +3.3V, +5V and +12V
Overload Protection +3.3V, +5V
Input Voltage 115/ 230 V
Input Frequency Range 50/60 Hz
Input Current 5A max
Output +3.3V@30A; +5V@28A; -5V@0.5A; +12V1@16A; +12V2@17A; -12V@0.3A; +5VSB@2.0A
MTBF 80,000 hrs at 80% load, 25 ?C ambient
Approvals UL, CUL, TUV, CB, VDE, FIMKO, DEMKO, NEMKO, SEMKO
FeaturesConnectors 1 x Main connector (20+4Pin)
1 x 12V (P4)
6 x peripheral
2 x SATA
2 x PCI-E
1 x Floppy
Features Vibration-Reduction rubber coating
And Overview information:
The XClio GoodPower 500W power supply is everything an enthusiast could want. Rock-solid construction makes it one of the more durable power supplies in the market. The power output of 500 watts, making it an excellent option for dual-GPU systems. SLI ready, it ensures that your purchase won't be rendered obsolete by the onslaught of newer technologies. The presence of a large 120 mm, ball-bearing fan ensures effective cooling and noise reduction. Vented back panel further aids heat dissipation by channeling air right over the core circuit.
The GoodPower is designed to last, with its MTBF (Mean Time Before Failure) of 80,000+ hours. Usage of industrial grade components ensures stable and unflappable output, and provides protection against power and voltage surges. It comes with one Main connector (20 + 4 pin), one 12V (P4), one Floppy, six peripheral, two PCI-E, and two SATA connectors. Bring the power home, and stop suffering the slings and arrows of outraged opponents!
My research:
Note: The following is to the best of my understanding of it. If I misunderstood something or overlooked it, sorry in advance.
Further research through the reviews indicated that when there is an over heating deal, it goes into Standby to try and protect itself. It doesn't actually shut itself down as I first assumed. When in Standby, the fan doesn't move. This is quite normal for this particular Power Supply. This also solves the mystery of what happened.
My computer got too hot inside and the heat sink of the graphics card melted off as a result. So basically, it was an overheat and the Power Supply saved the computer by going into Standby until the Graphics Card was replaced. Let's just say that I'm lucky only the Graphics Card suffered. I'd best improve the cooling to ensure it doesn't have anything else happen.
Remember, this is to the best of my understanding. I could be off somewhere.