![]() If you unplugged the charger between steps 1 and 2 then remember to plug it back in now. ![]() Turn the laptop back on by pressing the power button normally.All the other steps were to ensure we wouldn’t lose any information when we did this. Press and hold the power button on the side of the laptop keeping it held down for ten seconds until the laptop does a hard power-off.In particular, we don’t want Windows to start booting only to be powered off ten seconds into its boot sequence. We just don’t want Windows to be doing anything in the next step. Don’t be scared by entering the BIOS, we’re not going to make any changes.Turn the laptop on with a normal press on the power button and enter the BIOS by pressing F2 (repeatedly, to ensure the system detects the button press).This is primarily to ensure there’s no state in RAM that we’ll lose if we do the later steps incorrectly.However, if you have trouble with these instructions, and if you have enough battery for the laptop to start up with the battery unplugged, then try unplugging the charger between steps 1 and 2. This time, by the time anyone noticed, the battery was down below 10% so I had to try the instructions without unplugging the charger. The first time I did this, I unplugged the charger to make sure nothing in the laptop was taking power from the charger and retaining state even through the hard power-off. Since this problem occurs only rarely, it’s difficult for me to find a minimal set of instructions. Update : Older versions of these instructions said to unplug the charger. Having said that, nothing in this technique is anything that you might not do occasionally in normal operation when using the device. You may also want to run battery diagnostics, as described at the end of this article. NOTE: I take no responsibility for this technique, it’s not been approved by HP. Having run a battery diagnostic (repeatedly, including the BIOS version) to rule out a battery problem, I was eventually able to work out a way to fix this and get the battery charging. With the charger unplugged the charger light goes solid white instead of turning off. The usual tricks of unplugging the charger or shutting down Windows don’t work. The other symptom is that the charging light next to the charger socket flashes white once a second: One symptom is that the mouseover on the battery icon in the Windows system tray shows as “plugged in, not charging” even though the charger is plugged in and regardless of the battery level (: as noted above, this charging status indication may not be present any more): Unrelated: I’ve taken the opportunity to describe how to run the battery diagnostics.I had to spot the problem from the behaviour of the battery light, and the way the battery level wasn’t changing. When it happened this time, Windows was not indicating whether or not the battery was charging.It seems that some, but not all, Windows updates can trigger this.Update : I’ve had it happen again so I’ve been able to add more information to these instructions. I’ve described the symptoms in another article. Update : Last year the battery died completely. Normally it’s wonderful but very occasionally the battery won’t charge when plugged into the charger.
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