System suddenly won't power on (MSI K8N NEO2 PLATINUM NFORCE3)

System specs are
COOLERMASTER TAC-T01 WAVE MASTER ALUMINUM ATX 4X5.25 1X3.5 4X3.5INT case
MSI K8N NEO2 PLATINUM NFORCE3 ULTRA S939 AGP 5PCI SATA 1394 SOUND 1000LAN
KINGSTON HYPERX 1024MB DUAL CHANNEL KIT PC3500 2X512MB DDR 433MHZ 184PIN
ATI Radeon X800XT PE AGP
SEAGATE BARRACUDA 7200.7 200GB SATA 8MB 7200RPM 8.5MS OEM
CREATIVE SOUND BLASTER AUDIGY 2 ZS 7.1 1394 PCI RETAIL BOX
LITEON 16X DVD-ROM INT E-IDE RETAIl
MITSUMI FA404A 7-IN-1 FLOPPY DRIVE & FLASH READER CF/SM/SD/MMC/MS
LG 4163b dvd burner
Nothing has ever been overclocked on this system.
Everything is plugged into a Belkin Surgemaster powerbar.
I haven't mentioned the power supply. I'll get to that. I have been using an ANTEC NEOPOWER 480W POWER SUPPLY (ATX12V  DUAL 12V RAILS ACTIVE PFC W/ DETACHABLE OUTPUT CABLES) for about a year on this system without
any issues. One morning, I wake up, hit the power button on my coolermaster case, and nothing happens.
CPU fan won't even spin. Nothing happens.
O.k., blown power supply, I think . . . .
So I take out my Antec and put it in another system. That system turns on
without any problems.
Hmm . . .
I come here, and I read posts about
potential compatibility issues with Antec power supplies. But if it's a compatibility
issue why was my system working for about a year?
O.k., fine. I'll buy a Enermax 535W EG565P-VE FMA 24P (115/230 VAC) power supply.
I just plug it into the mainboard (nothing else). Hit the power button . . .
The CPU fan spins for half a second, and then nothing.
Did my motherboard just suddenly die for no reason?
Any suggestions?

Pull the AC plug from PSU and set cmos in clear position with battery removed for atlest 20 minutes perhaps longer .
Then try to post the system barebone .
Just cpu,1 pcs memory in slot 1 , gfx card , and keyboard in PS2.
No usb devices at all including card reader and no pci cards harddisks or cdoms/dvd/floppy.
It could also be caused by a short or a malfunctioning fan connected to mobo.
Try to disconnect all case fans from mobo headers if you have any connected to additional fan holders.
The chipset fan can also be disconnected momentarily just to see if it posts.
If none of this helps , replace cmos battery and try again .

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