"My laptop randomly shut down."に関する回答Your computer's motherboard likely needs to be replaced. Consult the Motherboard Replacement Guide.
"Why isn't my USB port working?"に関する回答Seeing how your mouse worked on all but one of the ports, it's possible the USB driver is corrupted. Go to the Device Manager menu, expand the Universal Serial Bus controller section, and uninstall each of the USB ports. Then restart the computer to automatically reinstall the ports. If the problem persists, you may have to entirely replace the USB port. The Troubleshooting Guide has a section on possible USB port errors you can consult for other possible answers.
"Why does my keyboard type multiple letters at a time?"に関する回答The problem may be the connector ribbon between the keyboard and the motherboard. Remove the keyboard using the instructions in the Keyboard Replacement Guide and try cleaning the ribbon. If the problem persists, replace the keyboard entirely.