Hi all I picked up an se 30 today at a great deal. Took it home it booted then had some error and froze. Knowing the batteries in these old Macs lead I opened it up and removed what was the original battery and replaced the motherboard back in the machine. Now the Mac shows garbles images all over it and the hdd spins but the light indicator doesn’t come on. I checked and rechecked all the connections and it’s all good. Any ideas?