Sorry to be the bearer of bad news, but it looks like your power supply is a possible time bomb.
I've seen a few Coolmax reviews at some of the best psu review sites and they were junk.
The following is from a review of a different Coolmax 750 watt psu:
Coolmax CUL-750B 750 W burned while we tried to pull 500 W from it at high temperatures. It burned exactly on the same point our first sample burned. The components that burned were one of the switching transistors and one of the +12 V rectifiers. Therefore, this unit shouldn’t be labeled as a 750 W unit, but as 475 W instead. Note that this unit has no protections to prevent it from burning.
On next page we will show you the video from this power supply burning when delivering 500 W. Coolmax CUL-750B 750 W Power Supply Review | Hardware Secrets
You're living dangerously if your power supply has similar performance and lack of quality.
Buy a quality psu ASAP!!
The best power supply review sites are JonnyGuru, HardOCP, HardwareSecrets, PCPER, and TechPowerUP.
I won't buy a psu unless one or more of these sites give it a high rating.
Most models from Seasonic, Antec, Corsair and XFX are very good to excellent.
Check Newegg Canada's prices, I recently saw my Seasonic X-650 80-plus gold rated psu for $90 from Newegg USA.
My Antec TP-750 New power supply got excellent reviews, was reasonably priced and 80-plus bronze rated.
With an overclocked cpu and single card video card, a good quality 550 - 650 watt psu will be fine.
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