Computer cycling power..


Nov 12, 2009

So My computer just started cycling power off and on the past few days. I noticed a day or so back that when i shut it down and turned it back on the power would cycle off and on pre post and few several minutes it would finally fully boot and can normal.

Today it will not fully power on. Here is what I have tried

Pull each stick of ram -nothing changed.
pulled video card- nothing changed
unplugged everything using the PSU minus MBO- nothing changed.
jumped psu and the PSU ran fine
pulled out MBO placed on the MBO box and attached everything and powered it on- still cycled power.

----I unplugged the 4 pin atx connector and the computer will power on and run but once i plug it back in it starts to cycle.....

I looked and did not see any back capacitors...could this be a dying MOBO?

Computer specs
p6t mobo
5850 Video card
8gb of ballstix tracer ram



^ + 1 would be my next attempt also. Just because the psu jumps off and runs a fan or 2 doesn't mean it can supply constant needed power to the 12v, 3.3v and 5v components. The jump test is just to make sure it's not dead.