Need Help!! Problems with Sonata II Power

[AlphaTea]

Readers Digest version:
OLD SYSTEM Antec SC750A w/350w PS, ABIT NF-7S, Barton 2500+ (not O/C'ed), 512mb Crucial, 20Gb HD, 40Gb Hd, Sony DL DVD-rw, Generic DVD-rom, 3.5 floppy, ATI Radeon 9600 XT, and a butt load of fans. all connected to a Tripplite IsoTel-6. Sounded like a runway at JFK. It ran 24/7/365 since 11/2000
I came home one day last week and it was not running. Nada. PS fan wasnt even spinning. Figures the PS gave up the ghost and I bought another Antec case
I moved everything over to the Sonata II with the 450W PS. connected everything and flipped the switch. Man that sure was sweet when the 120mm case fan started turning and the case lights came on.
For all of about 5 seconds.
Then the lights and the fan started cycling on/off/on about once per second. This would continue untill the power cable was removed or the PS switch (on the back) was turned off.
I have tried disconnecting every connector to the MB including removing the video card (even all at the same time) except the power with the same results.
So, is the NF-7S bad or the PS?
TIA for any and all help/ suggestions.

 

[AlphaTea]

Geez, nobody else had this problem?

 

[Golflad]

Could be a couple of things try clearing the cmos on your board then booting and if that does not work probably is board or cpu could have undervolted I had a 1700 + palomino on a NF7-s that happened to or something could be shorting out the board .... Here is what I would do

1 remove the board and ps fromcase and hook them up on a piece of cardboard or tabletop and reassemble the system piece by piece powering on between components until the problem happens again if happens through whole cycle is your cpu/board test each with another socket a board /cpu if possable of not this could be a good excuse to upgrrape to a cheap socket 754 sempron and tforce combo from the egg

 

[imported_rod]

Sounds like it could be a short circuit.

The power will be applied> the short circuit will occur> current draw will rapidly increase> the circuit breaker will turn off all the power> the short circuit will clear> circuit breaker will reset> power will be re-applied...

Try disconnecting all case fans and other mods (ccfl neon tubes etc...) and starting the PC like that (leave the CPU fan etc... connected). If that doesn't work, try disconnecting optical drives, hard disks any anything non-essential. Also, check to see if there are any tiny little metal shavings on the MoBo or anything...

RoD

 

[AlphaTea]

Very mysterious.
Put NF7-s in another case.
Same problems.
Original PS must have caused some collateral damage when it died.
I checked it over pretty close after I removed it from the case and could not identify any bad caps or anything else that looked outa whack.
I am in ther process of getting a used NF7-S from a member over in the B/S/T section.
I just pray it isnt my CPU that went bad...
Thanks for all of your input guys.