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My first step would be to take the laptop apart again. If it worked after the new fan installation, then can you install the old one (bearing the noise for a bit) and see if it turns on. Then replace the old with the new and if it fails, then perhaps the new fan is grounding your system out.
Getting to the fan on your laptop is VERY DIFFICULT. There's a lot more screws, wires and snaps holding the computer together than you'd imagine. It's best to get a professional to do it, however less and less people these days are willing to pry open someone's laptop because a lot can go wrong.
If you've backed up your laptop and are willing to risk not being able to put it back together, then go ahead. To get to the fan you actually need to get through the top. Unscrew every screw you can find on the back and the bottom. You'll need to open up the hard drive and motherboard because there's screws there too. Pry off the piece covering your speakers, then the keyboard, then unplug the ribbon wires by moving the little plastic things, all the while unscrewing everything you see. Good luck.