My tablo all of a sudden stopped working and I cannot connect to it. The light does not blink anymore when rebooted and the wifi password does not show up at all. I only connect via wifi
Reboot your router (aka power cycle it), then reboot your Tablo.
"The light does not blink anymore when rebooted " - could your power supply have died and gone to electronics heaven.
Try disconnecting the hard drive, and reboot the Tablo.
If it works without the hard drive connected, then the power adapter is probably good, but either the USB port, or the hard drive are having problems.
If the power adapter is good, then try the other USB port, and if that doesn’t work, then try a different hard drive.
In case you need another power adapter: