I own a Lenovo Legion — 15ACH6 laptop. It's past warranty period.
I also have posted about the term Legion.
This is most likely a defect from Lenovo in the overall interconnected Ryzen (AMD) processor ⇄ Radeon GPU (onboard) ⇄ NVIDIA GPU ⇄ power management.
My Lenovo Flex 5 — also post-warranty — with Intel processor, this blank never happened. Well, somewhere within the dual GPUs management perhaps was the culprit, possibly. Flex 5 has one GPU.
I mean, usually manufacturers don't deliberately put subroutines to make the customers defecate masonry, right? Right?
ðĪ
Right.
Indeed, it is a bug. Aside from the fact that this blank screen appeared conveniently when the warranty period was ended.
This is the laptop being awkwardly "dead". ⬇️
It was not off. The laptop was ON. The fans were running, the LED indicator on the power button was ON — the machine was ON. But the screen was BLANK, nothing was shown.
I use the "flip to boot" setting for my laptop. For both my Lenovo laptops.
Solution
An undocumented method to "power drain reset".
- Unplug ALL connected external peripherals like USB devices, HDMI, power charger, and so forth. Make sure to unplug the power from the laptop.
-
Press the power button and hold for 60 seconds. Use stopwatch or something similar to make sure it is done in 60 seconds. 
- Release the power button after 60 seconds.
- Plug ð the power ⚡ back to the laptop.
- Press the power button like we turn on the laptop normally.
-
The laptop should do this sequence of events if the reset succeeds: - Display an LED animation on its keyboard. ✔
- Show the "LEGION" splash screen. ✔✔
- Boot normally. ✔✔✔
-
We can enter the operating system. ✅
Prior to the Method Above
This blank screen happened more than thrice (post-warranty), above was the latest. Before that method, I did force-restart multiple times like a plonker. It worked, eventually.
But then, I realised that it is rather odd to do similar thing and expect a different outcome. Must be a way to reset it properly. I thought — Hm, let me unplug the battery, then? — On second thought. — Eh, no.
And there you go, the 60 seconds power button press.
Maintenance
I did check and recheck anything dubious afterwards. NOTHING was peculiar. So I guess — here's my guess — AFTER we properly reset the laptop with either method: the naturally daft method or the power drain method — the entire software (OS / BIOS / etc.) state would also be reset to its working state. Thus, NOTHING would seem peculiar afterwards! Unless we rummage through Windows 11 boot log like a psychopathic accountant. Which in my case, I didn't enable it. Very comical. —
Oh, no log. Enable it, then? No.
ntbtlog.txt [...]
From my blank screen experiences, there were no observable generic patterns. Well, I only had a handful of samples. And the blanks happened at bloody arbitrary chances. Could not recreate it on purpose.
The latest event above was I let the laptop on for more than twelve hours, but then I turned that off normally — I never used sleep deliberately, always shut down. Then the next day, BLANK.
Another time I didn't turn on the laptop for days, then when I turned it on — BLANK.
Other couple of times I just used the laptop normally, then BLANK on startup.
All of those blanks happened post-warranty.
Before that, NO BLANKS. Indeed!
Marvellous.
So, setting the jest aside, it may be related to the onboard GPU and NVDIA GPU being subject to irregularity with the power management — AMD style, a tiny mishap which Lenovo didn't quite get it right, I suppose.
But happened AFTER the warranty had expired.
I guess it was merely coincidence. I guess.
ðĪ Interesting guess, that.
Therefore — well, at least — we have the antidote if that happens again.
Thanks for visiting. ð