Power button light is flashing but not booting up

Power button light is flashing but not booting up

I recently bought a used sony h20, which the seller told me supposedly still works but has a broken battery. I bought a new one but the problem remains: the green light on the power button and the light beside the lens flash once when i press the power or playback button, but then nothing else happens. I tried connecting the camera directly to an AC adapter as well as my computer, but still no luck. What could be the issue here?