No accepted shares on cgminer (sync issue ?)
CGMiner does not need to sync with the blockchain, the pool does. The pool keeps a copy of the blockchain and only sends you the block that is currently being mined. If you don't see any share on BTCGuild's website, you should check that your miner's username and password are correct (they can be different from your main username and password). If you see shares, but they are constantly rejected, then you have a connection problem between you and the pool server. If this is the case, try changing to another pool.