My 10 months top of the line HP Spectre x360 13t (8th gen i7, 16GB memory, 1TB SSD, 4K display, W10 Pro) had started to actup from the day I unboxed it. The screen was flickering at random times. I called HP customer Support, but they were not able to correct the issue, specially as the issue showing randomly. Overtime, I managed to get use to this sxcreen flickering at times.
Then since few days ago, I noticed that, if I'm working on the laptop and restart it, I get a black screen. The laptop actually starts, but the screen stays black all the time. I'm convinced this is due to overheating, because this laptop always gets really hot-surfing the web makes the fans come at full speed-. I called HP support last night. The representative troubleshooted my laptop for about 2 hours, but couldn't fix the black screen issue when I restart the laptop. A service order was created to get my laptop repaired. It's going to cost me 10 days without of a computer! Hopefully they'll get repaired for good... not just reset the OS.
It's sad to say that I'm coming from a 2010 MacBook Pro that I used everyday for 8 years and NOT one single issue.
I'm now disappointed about this switching to HP, but I realize I'm lucky that this black screen came during my laptop's one year warranty. I knew the screen flickering on day one was NOT a good sign. I also found a lot of reviews on the web (Google, Amazon, HP, etc.) of people having the same black screen issue with their HP Spectre x360 within 1 to 2 years. Be aware. ;-)