I recently lent my Raspberry Pi 4 to a friend (big mistake). When I got it back, the red light on the Pi wasn't working anymore, and the pi doesn't want to connect to the internet. Neither Ethernet nor the onboard Wifi work at the moment.
The ethernet cable and port on my router works for another Raspberry Pi 2 that I own. So, I know the problem is with this specific Pi. I'm using the official Raspberry Pi power supply. It boots and I'm able to login using a monitor. SSH doesn't work obviously. The red light never turns on during startup or when it's running.
Please help. Thanks.