Whether on battery with or without power adapter plugged in, or on AC without battery inserted the same behaviour happens:...

It is hard to tell with so few details. you may have to reflash your device.

it could caused by a battery that discharged too much. you can try the flasher trick to force recharge the battery. run the flasher utility on your computer plug the device wait until battery charge reaches at least 10%

Hello, I do not know of repair shops in sweden or switzerland but replacing the battery on a nokia N9 is something you can do yourself. the replacement battery refrence is: Nokia BV-5JW the step by step instructions with pictures are in the service manual

this is an issue with MALF it is fixable through flashing the device. more details and instructions here: https://web.archive.org/web/202103300935... https://archive.is/CpxsL

if you have access to a computer you can take advantage of the backup feature of the phone. go to settings > sync > backup and do a backup on the first device. plug the device on a computer through USB and transfer the backup files, they are located in /home/usr/MyDocs/.backups/ then plug the destination device through USB and transfer the files into the same location on the destination phone. go to settings > sync > backup, select the backup you just transferred and tap restore. There is also a migration that can be done through bluetooth but I am not familiar with it.

the display connector might be dislodged during the fall. you can try opening the phone to check and put the connector back in place. instruction are in the service manual. otherwise the display might be broken and need a replacement.

you can replace the display assembly on a nokia n9. all steps are detailed in nokia service manual. most of the time a nokia n9 that will not turn on is due to a discharged battery. you can force charge it by using flasher utility. start the flasher utility, then plug your device and do nothing else but wait. this is a trick to force charge of a nika n9 battery was discharged too low. consider replacing the battery if this happens often.

Check battery health, could be signs of an old battery not holding a charge properly. If the battery is not end of life then you should look at the power adapter and the first two mosfets.

have you checked the power adapter is working as it should ?

similar issue here. on powering up the laptop the power led and wifi led turns on, the fan may or may not spin, the optical drive spins once and the num lock led turns on then off but the screen stays black. removing the battery, unplugging the power adapter and pressing the power button for a few seconds then plugging it again is sometimes enough to have the laptop turn on and boot normally. I’m about to open it and see if there’s any obvious issue inside and do a cleanup / change of thermal paste while I’m at it. hopefully this will help. -edit- I cleaned up the accumulation of dust, changed the thermal paste but the symptoms persist. I ran a test without optical drive and hard derive, plugging th laptop and powering it, the CPU and GPU instantly warm up but the fan does not start spinning causing the laptop to get quite hot. I used the multimeter to check the 19v power rail and it is present at different points, so probably not a mosfet issue here. I’m unsure the issue is screen related I suspect...