Your question: "I turn off my computer everynight. the last couple of mornings it has been on. what would cause it to come on by itself?
1 answer · Other - Computers · 1 min ago
Nearly every PC made today has a built in modem that can work via radio link.
It is possible that the computer can thus be activated remotely, especially if is connected to a power source, be that battery or distributed current.
The computer can also have been invaded by software that keeps it on standby using minimal power and appearing to be completely turned off.
In any case, having a built in wireless modem supplies the portal for control from uninvited invaders.
Some PCs may have other built-in portals that users are not informed about.
There is a reason that governments want to gain control of millions of computers around the world, and it is not necessarily to spy on its own citizens. If you cannot yet figure out what that is, it is beyond the scope of my reply to divert attention from your question to motivations behind electronic warfare. Ditto for the range of electronic warfare applications, which is a much more complex topic than just whether or not someone can turn on your computer remotely.
You should unplug your computer and disconnect it from its battery, if any, if you want to be sure it is not turned on. That is not a 100% guarantee that it cannot be remotely accessed but it limits the possibilities. Similar statements apply to wireless phones, cell phones, smart phones and other electronic communication devices.