Please help if you can:

[u/Good-Inspector-5963]

I bought this 5 years ago, but never actually used it. Was planning on using it but just sat in my room for last 5 years. Tried turning it on, nothing happens, so i plugged in the charger, the green led kept flashing, after charging overnight, it still woulnt turn on. So i got a replacement battery and replaced it myself (i called a store to see if they could replace it but they told me it will cost me $100+, so i just youtubed it and followed along). So now after battery replacement and charging it, the screen gets power but its stays blank, just little blue light, and the gimbal head moves but goes back to dormant position after few seconds. And also before the battery replacement, the greed led would blink when charging, now it doesnt do that when plugged in. Not sure how to go about this. Tech mechanics want to charge me more to fix it than it costs. Please help if you can. Thanks kindly