You need to take your computer to a shop for repair, but your hard drive in all likelyhood still has what you put on it. You can remove it and put it in an enclosure you can buy for around $30, plug it into a USB port on another computer, and retrieve your data that way.
Any time you remove the covers on a computer, you need to have yourself grounded to prevent static charges from damaging anything you touch. And I hope you've learned now that you need to have backup for your computer because things can and do go wrong even when you don't go inside the computer. When you've gotten your system back like you want it, I urge you to get yourself an external hard drive and a good 3rd party backup program. You can set it up to do everything automagically at the time and frequency of your choice. 1 TB external hard drives are about $70 these days and a really good FREE backup program is the Easeus Todo Backup Free which you can download from . That can save you a lot of time and frustration the next time something like this happens. Sooner or later it happens to all computers for one reason or another.