Why has my garage door opener (139.53975SRT1) stopped working?
You will need to consult the manuals troubleshooting section - usually the number of flashes/clicks indicates what the problem might be.

The most common issues I've seen are related to the safety sensors mounted near the door.  Sometimes they get knocked out of alignment, or there could be a short in the wire due to a staple.  The manual will likely provide instructions for temporarily shorting out this connection to bypass it.

It might also have overheated if you were operating it a lot - assuming you didn't burn out the motor, usually in this scenario you just need to wait for the unit to cool down.

The worst case scenario is that either the motor or logic board are dead.  You might be able to repair it, but the vendor will likely advice just replacing the parts.