On the Raspberry Pi can you see a red light as well as a flashing green light?
If you can only see a red light on your Raspberry Pi this would mean that you would need to re-flash your SD card with a fresh image of pi-topOS on a computer/laptop.
The best way to re-flash your SD card with the latest version of the pi-topOS would be to use the same SD card.
- Download the latest pi-topOS, by clicking on the link here: https://pi-top.com/products/os#download
- Visit https://etcher.io/ and download the free software package
Once this has been done re-insert your SD card into the Raspberry Pi and boot up your device.
If you don’t see a red light on your Raspberry Pi, check the LED’s on your PSU, this would confirm if power is going to the Raspberry Pi. If you do have power on the PSU a replacement Raspberry Pi would be advisable.