Quote: Originally Posted by theog
PSU has 24+4 connectors.
To add some words:
The mainboard needs a 24 pin ATX power connector, plus a 4 pin 12V CPU power connector.
The listed PSU has a 20+4 pin ATX power connector (good for both 20 and 24 pin ATX), and a 4 pin 12V connector. (It also has an 8 pin 12V connector, which the OP does not need.)
If you have separated the 4 pin block from the 20+4 pin ATX power connector, and are only using the 20 pin section, it might be a good idea to plug in the 4 pin section as well. I doubt that explains the instability, but it's not impossible. Don't confuse the 4 pin block with the 4 pin 12V connector that plugs in near the CPU.