4th GPU sitting at connecting?

[staraptor]

Running 7x32

With 4 GPUs running (3x5850, 1x5830)....I can get 3 of them to work in GUI miner.  Whenever I've tried to activate a 4th, it just sits either at connecting or shows a constant mhash rate, without accepting shares.  Regardless of which GPU I activate last, this happens.  Have tried with both poclbm and phoenix. 790FX GD 70 mobo. all cards are in x16 slots

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[jrtubs]

what power supply are you using? have you double check to make sure the info is correct? good way to check is to change it to cyperus[0-0] in your miner to cyperus [0-3] on your first worker, if it runs then its info error on your 4th card, if its not working and u get the same error then its most likly a power issues or your card is defective.

[Jezzz]

Sounds like a PSU problem to me.  But you might give another mining app a try.  I used guiminer initially, but have since switched to cgminer.