Let me preface by saying this is my first Mac, so I'm not aware of the usual Mac troubleshooting steps other than the obligatory shutdown/restart. If there are other basic steps I need to take, please let me know. On to the problem... On the morning of September 24th, I used my MacBook for light computing (internet browsing and music). When finished, I closed the lid and plugged the power cord into the Mac as I've done just about every single time since I purchased the MacBook back in June. Later that day, I unplugged the Mac and opened the lid. However, unlike every other time I've done this, the computer did not power on/wake up. I pressed the power button and received no response. I did a quick search and found I could hold the power button for about 10 seconds, release, and then press it again. That did the trick and I didn't think much else about it. After all, I would be updating to High Sierra the next day and any quirky setting would surely be remedied, right? I installed High Sierra the following day and the MacBook functioned normally. I used it off and on several times. Each time, I closed the lid when finished and it resumed when opened. Fast-forward to today and again, the laptop would not resume automatically when opening the lid. I had to hold the power button for 10 seconds, release, and then press again to get the computer to boot. This may be unrelated, but it took the computer about 5 minutes to find my wi-fi network when it booted this time. I've had issues with wi-fi connectivity for a couple of months and have opened a ticket with Apple. I was hoping the High Sierra installation would fix the connection dropping issue, but that remains to be seen at this point.