I tired to start miner to get test etheres in Mist, but is't shows a while 0.0 KH/s and than nothing. Looks like miner chrashed. Reinstallation didn't help. Also tried send test ether form faucet.ropsten.be:3001, no result. Any ideas? Maybe anyone can send me some test etheres: 0x366bae8CC220194911902473247df87579EE246e
Mining needs minimum RAM size of 4GB. If you your GPU is having very less memory than obviously mining will not start. In which test net you have connected. You can use,
Each an every testnet is having the faucet.
Please try adding ether through that, you will receive with in ten minutes.