Michael wants to know if it's harmful to keep a PC on all the time. Leo says it doesn't hurt the computer at all. In fact, it's probably better for the PC to leave it on since turning on the computer is the most stressful part of the process. But it does use electricity, even in "sleep" mode. But there's no need to worry about leaving the PC on.
Ralph has a Dell computer that spins up the hard drive when it's asleep. What gives? Leo says it's probably running a program like mail in the background and it will still retrieve the email from time to time. Windows 10 also phones home from time to time to check for updates, indexing files, etc. He can always run the Microsoft Process Explorer, as part of Sysinternals, to see what's doing on.
Sam has a Pixel 3 mobile phone that constantly keeps the screen on when he puts it in its holster. How can he stop that? Leo says that you can configure the Pixel in the settings to mitigate. You can create a lock gesture, for instance, or press the on/off button briefly to put it to sleep. Scooter X in the chatroom points to this forum post - https://forum.xda-developers.com/pixel-xl/help/fingerprint-to-sleep-android-9-t3838160
Vicky put her computer to sleep and now it won't wake up. Leo says that's often called "the Big Sleep," and is a common Windows problem. It sounds like Vicky is experiencing "sudden death" of her hard drive. If she can put it into another computer through the external USB plug, and she can see the drive, that means it's not dead. If it can't see it, she will know it's dead. If it can see it, then she can try booting up from it. She'll probably have to change the boot order to do it, but there's a keyboard command for that after she sees the Dell Logo.
Greg put his laptop in hibernation, and when he woke up this morning, it was on. How did it come out of hibernation? Leo says it's common that if there's an update or some preset network activity (like "Wake-on-LAN"), the computer can wake up. A tremor can wake it up as well. As a rule, Leo doesn't recommend hibernation because it can confuse the operating system, causing issues when waking up. Just let it go to sleep. Users can log out, though, for security issues.
Mars Worm in the chatroom is having issues with his hard drive unmounting in his Mac Mini when it goes to sleep. Leo says that computers going to sleep has always been a pain, going back to the early days. Hibernation is even worse.
Bob put his iMac to sleep and then when he went to wake it up, he got a "bong" with a blank screen. Leo says that those tones indicates different things depending on the tone. Here's a list. It's possible the backup battery in the computer is dead and needs to be replaced. But it could also be a failed hard drive. It could also be an EFI ROM update is in progress. If you hold down the D key when booting up, you'll go into diagnostic mode. If that doesn't work, then you have a major hardware failure.
Andrew's laptop goes to sleep and when he wakes it up, it shows a broken up video screen until he reboots. Leo says it wakes up confused, and he's not surprised since it's Windows. But he's never seen what Andrew describes. It usually causes problems like this with Hibernation, but not sleep. That's why he recommends disabling hibernate. But sleep shouldn't do that since the RAM gets refreshed regularly. If his BIOS is out of date, that could cause it. But it's never happened to Leo. Andrew should also make sure his display drivers are up to date.
Aaron wants to know about Windows' Advanced Settings that he can access via Windows Key + X. He's noticed it gives access to Control Panel and Leo says it has several settings to add and take away different features. But Aaron says the recent Windows 10 Creator's Update now puts his PC to sleep after a minute or two. How can find it in the new Control Panel? Leo says to look under the Power and Sleep settings. He went there and set it to 2 hours, but it still goes to sleep after a minute.
John wants to know if keeping his Mac on while he's walking around will damage the laptop. Leo says not if he puts it to sleep. It stops reading the drive that way.
What is a hardware password? A hardware or firmware password will keep the computer from starting up in any way other than its designated startup. On the Mac, he'd go into Utilities and set his firmware password. It's very important not to forget it, though.