I was using blockchain wallet for 2 years and everything was fine but 15 days ago they have some problems with there wallet.
I couldn`t login for 2 days after that they gave mi new address,
whenever you use one address the wallet automatically generates and saves a new private key and gives the public key to you in order to prevent address reuse.
but all the addresses and their keys are stored in your wallet.
i tried to import old address to use and they put it in watch only and now i can`t get my funds.
you should import your "private key" not "public key"
private key starts with 5 or L or K
public key starts with 1 or 3
I most say that my comp crashed and i lost my private key.
Their support would not even hear me, said they can not help me and that's it.
your computer crashing has nothing to do with blockchain.info they generate things in the browser and store it on their servers (encrypted) so even if you log in from another pc you still have the same wallet.