KT3v MS6712 System Won't power up after RAM upgrade

hello this is my first posting to this forum and I hope someone might be able to help on this as I am totally stumped.  I have been running my KT3V MS6712 mobo with 256MB since it was built. The manual for this mobo says it can handle up to 3GB RAM in any order or size. I have 3 DIMM slots and thought it would be more cost effective to just
purchase 1 DIMM leaving the other 2 slots free.  So I decided to  upgrade to 1GB and I bought a Kingston 1Gb PC2100 266MHz DIMM and installed it on my system.  Now my system won't power on at all. When I press the power button on the PC, the CPU fan spins for like 1-2 seconds then stops.  The system appears to be completely dead.  Cos I thought the problem was down to the new RAM installation I thought better put my old 256 DIMM back, however I still get the same problem. I have tried swopping both DIMMS into different slots but still doesn't work. The system was working fine until I did the RAM upgrade. I tried resetting the CMOS by moving the jumpers around in case it was a BIOS issue, still hasn't made a difference. Dunno if its the PSU which has suddenly gone, however seems strange. There are no beeps from the system or lights flashing to indicate anything.  I don't have
the D-Bracket installed either. I have also never upgraded the BIOS on this system as it has always been stable. The CPU is not overclocked. Has anyone had this problem before after a RAM upgrade?  Hope I have given you enough information 

Suntek is perhaps not the best of PSU makers, but a sudden collapse is not so common. You normally notice problems earlier.
I took a big beating last time I said this , but it is important that there is no power in the system when changing memory sticks.
It sounds a bit like the processor went away for holiday. Have you any data on the processor temperature? Is there any activity at all? Does the processor heat sink get warm?

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