My one year old build with Haswell processor and Solid Gear SDRG-750E power supply suddenly stopped working. It is not able to post. The fan on the power supply is spinning, the fans on the case are spinning, but the red lights on the motherboard for memory, CPU and VGA are blinking and it is not able to load BIOS. I don't know what next step to take in solving it and want to test the power supply. I have multimiter but I can not find any information on how to test the power supply. Let's say I unplug it from the motherboard and I have 24 pins (20+4). It is not labled to know what to test with what. Please, advise. Thank you