Power failure, computer won't boot - Is my entire system fried?

I was gaming and my GPU, mobo and CPU were in the 70~75C range for around 30 minutes. Then the computer made a loud shrill noise and then my screen went black.
The computer made its shutting down noise but the fans kept running. I could also tell my wifi adapter was still taking power from the USB ports since it was flashing, but otherwise the computer seemed like it was off.

I played around with the power and restart buttons, but they had no effect. I was scared to pull the cord so I just left it on. After 10 minutes the fans stopped running on their own. When I turn hit the power button, the fans spin for 3 seconds and then stop spinning. After hitting the power button a few times, the fans would not spin at all.
At this point, the computer does not turn on at all.

So I'm positive their is a PSU failure at the very least. What I'm wondering if my GPU, mobo and CPU are still okay? Is there anyway to know if their fried without testing them with a power supply?
The current computer I'm on has a 300w PSU that's 7 years so I'm not going to be able to test the components with a PSU.

Can anyone tell me if my system would be fried from the above the description and my system specs?

Off Speccy-
CPU
AMD Phenom II X6 1045T 39 °C
Thuban 45nm Technology
RAM
6.00 GB Dual-Channel DDR3 @ 535MHz (7-7-7-16)
Motherboard
ASUSTeK Computer INC. M5A78L-M LX PLUS (AM3R2) 54 °C
Graphics
HP w19 (1440x900@60Hz)
896MB GeForce GTX 260 (EVGA) 47 °C

PSU - bought in 2011 (seemed like my limited warranty just expired two months ago.. what bs)
APEX AL-D500EXP 500W ATX12V Power Supply
http://www.newegg.com/Product/Prod [...] 6817154026