How to Reindex Linux Core Wallet
1) Stop ./zoind daemon with:
./zoin-cli stop
2) Wait a couple of seconds
3) Restart the daemon
./zoind -daemon –reindex
4) You see the status with:
./zoin-cli getinfo
If reindex does not solve your problem or you are stuck in the splash window, then your blockchain or wallet.dat file might be corrupt. So the best way is to Delete everything in your Zoin folder and IMPORT your private key from your paper wallet.