i will be doing work on my Chromebook and then bam it just crashes and restarts

my HP notebook will pick up any WiFi signal but the WiFi in my house

Try checking the blinker fuse in the fuse box.

If there are no fasners on the blade then try seeing if the blades pull straight off the shaft from the motors?

If you have about 1/8 to 1/4 inch screw sticking out try a small vice grip if you do not have enough screw to do that there is a thing called an easy out or screw extractor. You should be able to get them at a hardware store and make sure to run the drill in reverse and to put lots of pressure on it.