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Can't turn on system after changing PSU.?

I'm currently running Windows 7 Professional

Spes

DDR2 Gaming RAM 2GB

Nvidia Geforce 8800 GTX

250 GB Hard Disk

Amd Athlon 4800+ Dual Core

After I changed the PSU the system can't turn on. The monitor starts upto acer and then turns off with orange light on. Please help.

Btw I tried to see if my PSU had any issues, I changed the PSU to old one and now I can't turn system on with old PSU either.

My friend told me, I had to remove CMOS battery and leave it for 5 hours after something like this. Please help me.

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