Hi there and welcome
Can you tell me please exactly which program you use for emailing on your computer?
Is it Apple Mail?
ok, but you access it via your internet browser such as Safari, or via an email program such as Apple Mail?
I can see you are a first time user to the site. What we do here is either a question and answer type of conversation or remote support where I would actually connect to the computer and have a look and attempt to fix the problem for you.
Remote support can save a lot of time if you are not comfortable performing repairs yourself. Sometimes even with instructions you can make a mistake and make things worse.
I will send an offer through for remote support and should you accept I will connect and see what is going on and fix the issue. Otherwise we can continue to talk like this but I will need to ask a number of other questions and try and walk you through some steps.
Both options are 100% guaranteed by the way. Remote is just quicker and avoids the risk of you making a mistake and doing something wrong.
If you want remote click get extra help. If not simply reply to me.
ok, and you can sign into Google mail via chrome?
Whats the error you get?
ok, so you say Stamp, so you mean then Apple Mail., nit via Chrome.
What exactly do you mean with nothing happens?
And yes, if you have internet the settings there are ok.
ok, but again, hat exactly do you mean with nothing happens?
What do you see when you click on the Stamp?
Ok, can you do the following please
Power off the mac
Then start the Mac and hold down the Command and R keys at startup.
Hold these keys until the Apple logo appears. After your computer finishes starting up, you should see a desktop with an OS X menu bar and an OS X Utilities window
choose Disk Utility from the Utilities window, or from the Installer menu if you're started from an installation disc.
Click the First Aid tab.
Click the disclosure triangle to the left of the hard drive icon to display the names of your hard disk volumes and partitions.
Select your Startup Disk (usually named "Macintosh HD").
Click Repair. Disk Utility checks and repairs the disk.
Let this complete and when it has, tell me if you still have the problem please.
hold the power button down until it does turn off.
Then turn it on please and do my instructions.
How did you go?