Pc not turning on after fan install. Power supply makes slight clicking noise

hansel81

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I have a Dell precision T 5500 workstation. I recently installed 2 fans in the rear of case. 1st was OK because I tested with just 1. After installing 2nd the pc didn't want to turn on but finally did, but hyper threading was disabled. I went into bios to unlock hyperthreading and it immediately crashed. The Psu is making a not too loud clicking sound when I try to turn it on but can't even get it to the 1st screen, I hear the hard drIves starting to kick on and then it switches itself off again. Sounds like a definite bad power supply I know but was hoping someone could suggest anything else. The immediate shutdown after hyper threading has me a bit worried. Not a pro here, Please Help!!
 

hansel81

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[Qqquotemsg=14854132,0,1658454]Your power supply is not providing enough wattage to be able to run everything. Upgrade your power supply.[/quotemsg]
Probably should have mentioned too that I unplugged both fans when I'm trying to turn it on now and still nothing. Also it is a 875 watt PSU, not sure how much the dell uses for other stuff.
 

hansel81

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Not loud clicking sounds pretty quiet actually.