First, switch off your PC and disconnect it from your mains. Earth yourself by touching something metal, say for example a radiator, and then open the case. Remove and reseat each component therefore, making certain all components are replaced and cables are reconnected correctly.
Also, make sure that all connected tools are firmly seated inside their ports; if you are fiddling with all the insides of the PC you need to ensure a RAM chip or video card hasn't come unseated. Ideally, you can work out which component of your respective PC is acting up; this would make the call process much simpler as the phone tech won't be in a position to refer you to another company as it's a problem with that third party's product, not with theirs. And if your machine is constantly de-activate all of a sudden, go with a local PC repair shop - it could need a new motherboard or any other component.
Here's the best way to streamline the tech support process and make certain you have the fixes you'll need. Another way, if you can, begin with determining on your own exactly what isn't working. The more details you can put together in what part of your respective computer isn't working, the greater - especially if you use a smartphone or an extra computer handy that you can use to plug those details into Google. Chances are, any difficulty you've got with a little bit of technology is one that somebody else has received as well, and if you're lucky, they've posted extensively regarding it on the forum or company's support site.
Also, don't forget to keep your stress level low if you are troubleshooting. You should also execute a few basic tests yourself: reboot into Safe Mode if ever the problems persist, and try booting from a recovery disc and run Windows' included diagnostic tools to determine the state of your respective hard disk drives, RAM and system install.
Generally speaking, in case you were unable to solve the problem with Windows' built-in diagnostic tools, the first-level techs aren't likely to be able to repair it by asking you to definitely reboot or reinstall Windows, and you're probably calling tech support because your issue is so bad that you will need someone to authorize a guarantee replacement part.