I have never heard of that MB, but in general, ECS is a good basic board. Just not made for high performance and especially not overclocking.
Most likely it is the cheap Dynapower PSU. On poor quality PSUs, it does not really matter what the wattage rating is, they are just junk. You could buy a PSU tester for $10 or so to confirm, or use a voltmeter on one of the unplugged 4 pin connectors. Put the ground probe in a black wire, and the other on one of the colored wires and see what you read. ATX tolerances are +/- 5%.
If you need a new PSU, this one would do without breaking the bank. http://www.newegg.com/Product/Product.aspx?Item=N82E16817371006