TS1440 Tried to turn on Mac and screen is just white/grey with a question mark coming on and off-.are the recovery steps safe to do myself as I am not very computer literate?

I have tried to turn on the iMac at work and it is making a funny noise like rain drops, very slow ticking and also a blank screen with a flashing question mark comes on. What should I do? I downloaded the Apple hints in rectifying this but I am not computer literate and am a bit nervous to do it as it is the computer of the person I work for....any help appreciated - I was going to go for the simple option and take it to the Apple store - what should I do? Heeeeelp :-)

What does Mail/Window/Connection Doctor Show? If the server is red, select it and look at the Show Details box.
Troubleshooting sending and receiving email messages
Troubleshooting sending email messages
You change the SMTP in Mail/Preferences/Accounts.

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