Turning it on with just battery and no AC adapter works fine. Turning it on with the AC adapter plugged in (with or without battery) results in it not coming on at all, or coming on briefly before abruptly turning off and it won't turn on again until the battery is removed and put back in. It also seems to work fine if you turn it on without the AC adapter, let it boot up, and then plug in the AC adapter. Issue persists with or without a battery plugged in and with multiple OEM AC adapters.
I'm hoping to find some information on how to troubleshoot this further. Also, if I end up needing to replace the systemboard, is there a list of compatible models somewhere? I'd like to get one that is at least as good if not better than the one already in it.
ETA: Here is what I've tried so far:
- tried different batteries and chargers
- tried both Windoze and linux
- reseated the RAM
- cleaned the CPU fan/heatsink and new thermal paste
- BIOS update