There are two (or more) power connectors from the P/Supply to the motherboard. One is a small 4 or 6 pin Molex type connector, it often plugs in near the CPU (not always). The other(s) are the large multi-pin ATX connector(s) that usually connect along the edge of the motherboard. The smaller plug referred to here is required to allow the start button to power up the machine. Make sure you didn't miss reconnecting that.

Also, the new case presumably came with front panel switches and a harness. Are all of these connected to the M/B and correctly?


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