I have a custom built PC that my brother put together for me a few years ago, i use it daily, and it suits my needs. I got home late last night, and my computer was on just how i left it, i was really tired, so after about 10 minutes of checking forums and whatnot, i held in the power button to force shut it down (i was too tired to actually click the buttons for a normal shutdown). Then, this morning, i woke up around 11:00 AM, and started my morning routine, which primarily consists of turning on my computer. I was going about my business, but then i tried to turn my computer on, just pressing the little black button. I click it, nothing happens, i click it again, same yield. I know a fair bit about computer software, but not a whole lot about hardware, so first things first, i make sure the power cable hasn't fallen out, it' securely in place. I check to make sure that the switch on the PSU was in the on position, it was. Then i plugged the power cord into a different socket, thinking that the socket may just be bad, nope, still nothing. After doing some research, i figure that its just the PSU, and hopefully not the mother board. So here are the specs of my current PSU, if you can find me one that has the same specs, thank you, but if you think it may not be the PSU, please say something ASAP, most of my day consists of online work, and i am currently borrowing one of my family members macs, which is shitty as macs come.

Maximum Power 450 Watts
Switches ATX Logic on-off
additional power rocker switch
115/230 Volt selector switch
Special Connectors ATX12V
3-pin Fan Sensor
SATA
Transient Response +5V, +12V and 3.3V outputs return to within 5% in less than 1ms for 20% load change.
P. G. Signal 100-500ms
Over Voltage Protection
recycle AC to reset +5V trip point < +6.5V
+3.3V trip point < +4.1V
+12V trip point < +14.4V
Leakage Current < 3.5mA @ 115VAC
DIMENSIONS

Unit Size 5.9"(W) x 3.4"(H) x 6.1"(D)
14.9cm (W)x 8.5cm (H) x 15.8cm (D)
Net Weight 5lbs.; 2.3kg
INPUT
Input Voltage 115 VAC / 230VAC
Input Frequency Range 60Hz/50Hz
Input Surge Current < 60A @ 115VAC
Input Current 12.0A for 115VAC
6 .0A for 230VAC
Hold-up Time > 17ms at Full Load
Efficiency > 70%
EMI/RFI FCC Class B
OUTPUT
+3.3V +5V +12V1 +12V2 +5V SB -12V
Max. Load 32.0A* 30A* 15A* 17A 2.0A 0.3A
Min. Load 0.5A 0.5A 0.4A 0.4A 0A 0A
Load Reg. ±5% ±5% ±5% 5% ±5% ±5%
Ripple V(p-p) 50mV 50mV 120mV 120mV 50mV 120mV
* +5V, +12V1, 12V2 and +3.3V maximum output: 410 Watts max
* +5V and +3.3V combined output: 150Watts
ENVIRONMENTAL
Operating Temp. 10 to 50ºC
Operating Alt. Sea Level 10,000 ft.
Non-Operating Vibration Operating: 10-300 Hz, 0.5G, 3 axes, 1 hr. ea. axis
Non-operating: 10-300 Hz, 2.0G, 3 axes, 1 hr. ea. axis
MTBF 80,000 hrs. @ 25ºC
Approvals UL, TUV, CB, FCC CLASS B, CUL