New Computer made loud pop and smoked, but shows no sign of damage.

I just built my computer over the weekend and its been working fine, but earlier I took out the PSU to check because I started to hear a high pitch whine. When I went to plug everything back in and start up the computer to inspect the PSU better there was a loud pop inside my computer and it started to smoke, but it didn't smell and it was a white smoke. I immediately turned off the PSU and inspected everything from the CPU,Mobo, and GPU and there was no sign of damage. No black mark, no blown capacitor.The PSU was out of the case at the time so I know it wasn't the PSU. When I went to turn the computer back on everything seems to be working like as if nothing had happened.

I saw that someone posted a similar issue last year, but they were able to come up with a possible reason so I wanted to post this issue again to see if anyone knew what could have happened.

PCPartPicker part list: http://pcpartpicker.com/p/3iU3P
Price breakdown by merchant: http://pcpartpicker.com/p/3iU3P/by_merchant/
Benchmarks: http://pcpartpicker.com/p/3iU3P/benchmarks/

CPU: Intel Xeon E3-1230 V3 3.3GHz Quad-Core Processor (Purchased For $249.99)
Motherboard: MSI Z87I Mini ITX LGA1150 Motherboard (Purchased For $129.88)
Memory: Crucial Ballistix Sport 8GB (1 x 8GB) DDR3-1600 Memory (Purchased For $67.99)
Memory: Crucial Ballistix Sport 8GB (1 x 8GB) DDR3-1600 Memory (Purchased For $34.99)
Storage: Sandisk 128GB 2.5" Solid State Disk (Purchased For $55.98)
Storage: Western Digital Caviar Black 1TB 3.5" 7200RPM Internal Hard Drive (Purchased For $0.00)
Storage: Seagate Barracuda 2TB 3.5" 7200RPM Internal Hard Drive (Purchased For $79.99)
Video Card: MSI GeForce GTX 770 2GB Video Card (Purchased For $319.99)
Case: Corsair 250D Mini ITX Tower Case (Purchased For $92.09)
Power Supply: EVGA SuperNOVA 650W 80+ Gold Certified Fully-Modular ATX Power Supply (Purchased For $59.99)
Operating System: Microsoft Windows 8.1 (32/64-bit) (Purchased For $88.99)
Monitor: Asus PB238Q 23.0" Monitor (Purchased For $0.00)
Monitor: Asus PB238Q 23.0" Monitor (Purchased For $0.00)
Case Fan: Cougar Vortex 60.4 CFM 120mm Fan (Purchased For $9.99)
Case Fan: Cougar Vortex 60.4 CFM 120mm Fan (Purchased For $9.99)
Fan Controller: NZXT Sentry Mix 2 Fan Controller (Purchased For $34.99)
Total: $1234.85
(Prices include shipping, taxes, and discounts when available.)
(Generated by PCPartPicker 2014-03-31 23:44 EDT-0400)