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From Control Panel, you would need to edit the power plan, then click on Advanced Options

https://1drv.ms/i/s!AsO_d59wuLnNoKkhyIC ... g?e=sGX4fR

Or you can use the command line

powercfg /hibernate off

As I said, as shipped, the unit has Hibernate set to 3 hours even when sleep is off. Open Control Panel/Power Options and disable hibernate.

I don't think it's about the wattage. Some GaN chargers work, others don't. It seems that the single port units are more likely to work correctly. This might be because the multiport ones try to rebalance and might cut power momentarily. That's enough to take the PC off.

Confirming - Anker Nano II 65W Charger, Model A2663 - Works perfectly

I have been running with this for the past 3 days with no issue. It is more efficient than the stock power supply, dropping my overall power consumption by 10-20W.

Thank you, hsehestedt, for doing this! It's incredibly helpful. My UGREEN 65W CD244 is a 3-port and behaves identically to the Anker 3 port that you tested. I am going to return this and look for the Anker 1 port, 65W that you recommend.

Sorry to say this doesn't work, and I'm not sure why. I have a UPS which the standard power supply is plugged into. But I wanted a smaller power unit. I purchased the UGREEN 65W GaN charger from Amazon and attached to the rear of the unit.The system will power up but then shut down in less than a mi...

That's a Windows setting. They have hidden this in Windows 11 for some reason. By default, it goes into hibernate at exactly 3 hours even if you have it set to not sleep. You need to open the old Control Panel applet to adjust this and change Hibernate to Never.

I have done this. There should have been a very tiny ribbon cable with your PC. One end has a standard 2.5" SATA plug, the other fits (with some difficulty) to the motherboard. There should also have been instructions.