title: ethereum miner not giving ether to coinbase account
body: <p>I am relatively new to Ethereum. I was trying to set up a private test network.
  I used the following genesis file:
  <code>{
  "config": {
  "chainId": 15, 
  "homesteadBlock": 0,
  "eip155Block": 0,
  "eip158Block": 0
  },
  "difficulty": "20",
  "gasLimit": "2100000",
  "alloc": {
  "7df9a875a174b3bc565e6424a0050ebc1b2d1d82": 
      { "balance": "300000" },
  "f41c74c9ae680c1aa78f42e5647a62f353b7bdde": 
      { "balance": "400000" }
  }
  }</code> 
  The following commands were used to initialise and start the network:</p>
  
  <pre><code>geth --datadir "C:\Users\Mahe\Desktop\Ethereum\data" init "Path_to_genesis"
  
  geth --datadir "C:\Users\Mahe\Desktop\Ethereum\data" --nodiscover --networkid 65535 --port 60303 --rpc --rpccorsdomain "*" --rpcapi "web3,eth,personal,miner" console 2&gt;Node2.log
  </code></pre>
  
  <p>The network started successfully, after which I created a new account and set it as coinbase. eth.coinbase is set and gives the address of the created account.
  However, there is no increase of ether in the created account upon mining(eth.getBalance(eth.accounts[0]) returns 0). Any help would be appreciated.</p>