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I've had one of these calls. I kept the guy on hold whilst I switched my computer on....he waited for 15 minutes. Eventually I picked up the phone after telling him it would not switch on. He said this might be because of serious virus infection.....He asked me to "pull the power cord out of the back as this will reset the parameters of the system motherboard".....I told him I couldn't find the cable....he asked why......I said "it's dark in my house at the moment, we've had a power cut for the last 2 hours, do you think the power cut is caused by my computer virus?"......he hung up.