Honor 4x LED blinking but doesnt start

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A

Android Central Question

Hey guys, I tried to fix an old broken Honor 4x thinking the battery was dead because there was no sign at all. After ordering a new battery online and replaced it now I can see the LED blinking both colors red and green successively after charging and trying to start it, but it won't start

All connectors are put tight
Charged for a few hours already using different adapters
I don't see anything else damaged
The PC doesn't detect it and I tried recovery mode as well, nothing on screen
I am not sure if it had water damage, it's been a long time, but it could be... any thoughts on that?

Have any thought why this occurs? Hopefully will get an answer for such an old model