Stuck on Apple logo, Won’t go into Disk Mode

Hi!

I’m trying to get my brother’s black and white classic up and running. I’ve had this same problem for a while, so I replaced the battery. But it still will stay stuck on the Apple logo. When it was charged, it wouldn’t go to disk mode, two times it let me go into diagnostic mode. To get it “off,” I have to let the battery drain. Now it won’t even go into diagnostic mode anymore. Does anyone have any idea what I need to change/replace?

Here are photos of the logic board with the battery and HDD unplugged: