I have 2 accounts with initial balance, 100000 and 120000. I tried 2 transactions. The 1st was a 20000 ether transaction from the 2nd account to the 1st. And a 1000 ether transaction from the 2nd account to the 1st. Both of them didn't make a difference to the balance.
I think you need to run mining process. Try to run in console the command
then to stop mining run
miner.stop(). Of course, the mining rpc api should be activated when you run geth