I have a single ethereum address that has ether in it from 2015 when I was playing around with Geth and the CLI. I have removed the blockchain and associated homebrew files from my computer. How can I transfer that balance from that ether account into something else? Is there a way to do it without syncing with the network? Could I just somehow import the address into a wallet like Jaxx? Thanks for the help.
In the end, you simply need to sign a transaction using the private key to that account and broadcast it to the network. There are a variety of ways to do so, depending on your skill level.
See What is the recommended way to safely store Ether? for more details. Also search this site for "MyEtherWallet".
You could use https://www.myetherwallet.com/#send-transaction to send your funds to poloniex
Follow these instructions:
1-Find your keystore file. (%appdata%/Ethereuem/keystore in windows).
2-Open MyEtherWallet and go to the “Send Ether” tab.
3-Select your keystore file or enter your private key.
4-If a password appears, enter your password and then hit “unlock wallet”.
5-then go to Go to Poloniex and get a deposit address.