This is thread to discuss the non-mining problem. I see other people are experiencing the same situation.
The problem is:
1. The geth/ethminer combination is all configured and running.
2. The ethminer log shows all the proper MH/s numbers and the graphical card makes all the sound
3. The geth node is in sync with the network. It is green most of the time on the https://stats.ethdev.com/
...and yet, the miner never mines anything.
In my case the miner shows 17MH/s performance. With the current 4G difficulty I suppose to mine at least some blocks every hour. I am running the thing for 4+ days, and never solved a block.
Let's try to understand what the problem is.
P.S. It is not the problem of mining into some wrong address, or anything like it. The miner for sure never solves a block.