Like everyone is saying, take everything off/out, try turning on, then plug stuff in one at a time.
I had one experience where I had forgotten to open the CPU socket lever before inserting the processor, took over an hour to figure out
More often than not it is simple human error
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Yo-DUH_87
If it works, fix it until it's broke!
Then, after it's broke, add duct tape!
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