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If I connect the AC power to the system it will show full power (fan works - hard drive light is on and giving sound for reading the HDD attached to it) The problem is it doesn’t complete the process of booting as the fan keeps running, but the light for hard drive is always on (which should turn off in 10 sec before boot) black screen, battery won’t charge. So its getting power for motherboard but no process is going on (example if I connect a USB drive it shows connection light but won’t read the data) Any advice will be appreciated and thanks in advance .
Sadly it does appear your logic board has issues and your battery is likely in need of replacement as well as they used older technology which just doesn’t hold up well. Locate your system from here Parts for Black/White MacBook systems then drop down to the logic board listing to see if you can find a new board. Finding a good battery will take more effort as you want a fresh battery not a recycled one. FYI: Determine battery cycle count for Mac notebooks
