Phone won't boot up, screen stays black only vibrate - Android Q&A, Help & Troubleshooting

Hello all,
When i try to boot my phone, there is only a vibrate but the screens stays off (not black, there is no backlight, the screen doesn't turn on).
Except when i press power + volume up, then i get the screen to go to recovery, fastboot, or boot normal but it doesn't matter which i choose, after that the screen goes off again.
Does anyone have any suggestions? Luckily i swapped phones a day before it broke so i wouldn't lose important files but it would be nice to be able to recover them.
Thanks in advance!

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