Transaction ID not found- Status still unconfirmed after a month? I did a transaction back to my bitstamp account on 23.02.2016 but it has not been received. Transaction ID:

1886e0c49ba43a842043fc84358a05d3faf69468c1547e1d2ef3e030b929f834


I do have the blockchain located on an external hardrive since it takes up so much space. Any help on how I can get the transaction to go through?
After 72 hours the transaction will get purged from the mempool if no miner has picked it up. Try resending the funds and include a transaction fee so that the miners will expedite your transaction.