well, if people can download jailbreak apps without jailbreaking i think lot of people not go the jailbreak. They say AppZule Store is allow you to download those kind of free jailbreaking app. Anyone in here who used it?
I assume that monitor is the problem here. Before going furthermore and troubleshooting confirm if it is just the monitor that does not working. If it is not just the monitor it can be the BIOS misconfiguration in motherboard. Clearing CMOS might fix the problem. After that Press and hold power button for more than 5 seconds. Then try to power on and see if it is boot normally.
Most of the times this kind things happened (i mean wont responsive) because firmware crashes. You should check the Galaxy S9 troubleshooting page because there can be solution for your problem. Have you try to force restart it while connecting to the charger? #
I guess that blank screen means a black screen. This happens because panel calibration is incomplete. Its normally go back to normal once it complete. If you don't want it to run set the picture reset mode to off. Get remote control and press the home button. Go to settings. --> system Preferences category --> Retail mode settings --> picture reset mode--> off
You should check the battery. This can happen because several reasons. it s lifetime might be about to end. Make sure to block unnecessary notification ,adjust the brightness level and turn off wifi syncing. These are usually save the battery life.