My pc not coming on and it's fully changed, every time I try putting it on the power bottom keep blinking blue, i don't know what is wrong, could some one help me out here?

Make, model, age and details matter. While I know the Dell desktops have some Orange blinks that tell us something it's always been failed hardware. I would like to help but I can't offer what it could be with such little information.

However the troubleshooting of a Dead PC is a well discussed topic. Here's a random tutorial about this: https://www.youtube.com/watch?v=Zz9pMKy9Mbs

The make, model and age along with what it does since sometimes you find an old desktop that you can replace with some under 200USD desktop which would be cheaper than a visit to a repair shop and if it's old enough, it's an upgrade.

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