My computer won't start

I have a desktop computer . Fe
w days back when I turned on my PC it refused to start . What could be the possible reasons and how to turn on the PC . Please give me some solution
 
It could be a load of things. If it has been working previously with no issues and you've checked the mains power, fuses and switches it may well be that the PSU has failed. Post what, if anything, happens when you try to boot up.
 
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