disconnect the ATX Motherboard Power connector after you turn your PSU switch OFF. Reconnect your ATX PSU connector to the controller board. Switch the power on.
Also make sure you have all 5 power cables hooked up.
2 x pciE 8 pin
2 x CPU 8 pin
1 x atx mainboard power connector.
Before you reboot the machine, first have a look at the tab
Status -> Cgminer API log
and look at the numbers behind
[match_work_count1] => 239017
[match_work_count2] => 239336
[match_work_count3] => 240190
[match_work_count4] => 239549
[match_work_count5] => 239449
[match_work_count6] => 239708
[match_work_count7] => 238995
[match_work_count8] => 238508
[match_work_count9] => 239126
[match_work_count10] => 239069
[match_work_count11] => 238590
chances are one of your modules is not getting power and it will show it with considerably lower numbers (might even be 0)
The modules are grouped by 8 lines so you can spot where the problem is
So my hashrate just dropped to 40ghs and this is what the log is showing.