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Computer will not boot after switching case

Last response: in Components
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I have had the following system working perfectly for over a year now

core i7 950
asus p6x58de motherboard
18GB DDR3 ram - 3x2GB sticks and 3x4GB sticks
750w casecom PSU
evga gtx 460

Today i purchased a Bitfenix Colossus case and after removing the components from the old case and installing into the new case i turned the computer on. It stayed on for about 20 seconds and then shut off.
Now whenever i turn it on the cpu and psu fans twitch and then nothing.
I have been trying to fix it for about 3 hours and i have tried unplugging everything, tested the PSU with the paperclip trick and breadboarding the MB.

any help would be appreciated.
i can provide pictures/videos if needed

thanks

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How about the motherboard mounts, check for possible grounds/shorts. Also the connector back plate. Client of mine once had a tab off the back plate that was sticking into the USB plug grounding out the system and causing all kinds of problems.
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ill try re installing the MB now with all the stand offs and making sure the connectors arent touching anything.
But wouldn't the fact that it doesnt work even when i tried to get it working with the MB out of the case mean thats not the problem?
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