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My PSU just blew up...?

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I've had this computer for 4 years or so but had it in my closet for a while since I've upgraded since then. I went to plug it in today to reformat it for a friend, but when I powered it on a loud pop noise went off. I'm assuming my PSU is most likely dead at this point, hopefully that's all that's fried. My question is how could this happen? I plugged the PSU into my surge protector with the same power cord as my other PC.

Specs of computer if this helps:

1 x OCZ StealthXStream OCZ500SXS 500W ATX12V / EPS12V Active PFC Power Supply

1 x ASUS P5Q Pro LGA 775 Intel P45 ATX Intel Motherboard
1 x SAPPHIRE 100244L Radeon HD 4850 512MB 256-bit GDDR3 PCI Express 2.0 x16 HDCP Ready CrossFireX Support Video Card
1 x Intel Core 2 Duo E8400 Wolfdale 3.0GHz LGA 775 65W Dual-Core Processor BX80570E8400
1 x Mushkin Enhanced Blackline 4GB (2 x 2GB) 240-Pin DDR2 SDRAM DDR2 800 (PC2 6400) Dual Channel Kit Desktop Memory Model 996587
1 x Western Digital Caviar Blue WD6400AAKS 640GB 7200 RPM SATA 3.0Gb/s 3.5" Internal Hard Drive -Bare Drive
1 x XIGMATEK HDT-S1283 120mm Rifle CPU Cooler I5 775 AMD compatible

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My other computer / tv / receiver are all plugged into the same surge protector/wall so I'm sure there is power, what I was more confused of is how my PSU could blow up. I always figured it would only blow up like that when you used a 220 vs a 110.
Power supply Master

There may still be power to the other things, but they are not powered off the cable that goes to the Pc, that is the one that you need to check, not the strip/surge protector, another way would be to get another Psu cable that you know works and try it with the suspect Psu
or try the one from the 'blown' Psu in a known good Pc,
Moto

I'm actually using the same power cord that blew up the other PC. I simply unplugged my main PC before plugging it into my older PC. After it blew up I replugged my main PC back in (in hindsight this was pretty stupid), but I'm lead to believe that the problem is not the power cord either.

On a side note, when I plug my old PC back in, I see the power light on the PSU light up but the computer will not start at all (not even a burst of life i.e. fans or lights coming on)

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Power supply Master

Ok, that rules out that cable being at fault then, next up, unplug the Suspect Psu from everything in the case, plug it into the wall and short the green pin on the 20+4pin block with the black pin next to it, if it doesn't start the Psu is dead, if it does then the Psu isn't the problem
paperclip jumper link
Moto
Power supply Master

No, obviously some power is getting through, I'm not up enough on electronics to know what or how, but if the paperclip doesn't fire it up, its dead, don't mess with it any further.
time to find a replacement for your mate I'm afraid
http://www.thermaltake.outervision.com/ will help you calculate the wattage required, or if the old one has the Watt rating on it, follow that as obviously its enough to power the system
**Edit, you posted as I did, thank you for B.a. man,
and good luck with the new one :) 
I'd also clean the Pc to make sure its ok, no dust etc built anywhere
Moto
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