Provided it doesn't void warrenty do what xlsior said. Start with all the power connectors, unplug and firmly reinsert them into where they came from. Do the same for expansion cards, sata cables, memory modules, and even the CPU! The fact that it posted fine and now it doesn't says something suspicious. It could well be related to your CPU.
Have you performed a CMOS clear? Sometimes the defaults will get it posting and you can tweak it form there. CyberPower might have given it some hard memory timings, or higher FSB speed which might be wreaking havock on the CPU.
Have you performed a CMOS clear? Sometimes the defaults will get it posting and you can tweak it form there. CyberPower might have given it some hard memory timings, or higher FSB speed which might be wreaking havock on the CPU.