asus zenfone 5 shuts down during boot

[tibo_huyers]

Please tell us some basic information before asking for help:
Model Name: zenfone 5 ZE620KL
Firmware Version: latest version
Rooted or not: not rooted
Frequency of Occurrence: doesn't turn on
Last night when i picked up my phone from my desk it was off. It should have had about 80% battery left. It has done this before and normally I just hold the power button and it turns on. When I tried this it showed me the "powered by android" followed by an asus logo and then a few seconds of black screen before it turns of. I tried again this morning and its doing the same, sometimes after the asus logo there is a split second of some glitching graphic and then off.
I have tried power + volume up/down, power + volume up gave me the asus logo and in the top right it said something about fast boot and to hold down the power button but the message was not fully readable because of the notch. I then turned it of but now I can't seem to do this again. It seems like it wont turn on at all after this.
The only option that i have left is to open it up and disconnect the battery.

[Christine_ASUS]

Hi tibo.huyers
Thank you for your asking. Please try the following steps to access recovery mode for the Factory Reset:
0. Try to back up your data with USB cable. If you can not access the phone, please check if your google account or microSD card have auto backup your data. 
1. Power off the phone, then keep pressing "volume down key"
2. Press "power key" and stop press " power key" once you feel the vibration. Still keep pressing "volume down key".
3. Stop press "volume down key" once you enter [Android Recovery] Screen
4. Choose "Wipe data/factory reset">"Yes"
5. "Reboot system now"
#Hardware Reset Guide
https://www.asus.com/support/FAQ/1006346/
Please note that once the steps are completed, all data, apps, settings and personal information will be deleted.

If you can not perform the steps above, please bring your device to the nearest repair center for further device checking: https://www.asus.com/support/Service-Center-All-Countries/
If it is impossible to access the service center during Covid-19 period, please try Call us: https://www.asus.com/support/CallUs