From your question, you didn't mention anything about the Keychain
.
You need to import the Private Private Keys from your old machine to your new laptop.
- Open the 'Keychain Access Application' and select the 'Keys' category.
- Control-Click on the private key associated with your iPhone Development Certificate and click ‘Export Items’ in the menu. The private key is identified by the iPhone Developer: public certificate that is paired with it.
- Save your key in the Personal Information Exchange (.p12) file format (password protected).
- Copy the p12 file to your new machine and install it there.