Acer 5920g with blinking power adapter.
Check capacitors PC112 and PC118. They are located near the memory slot.

Delay boot, takes a few try before booting up normally.
Reseat fax modem or replace it if reseating doesn’t fix the problem.

Not charging a known good battery.
Check fuse near battery connector.

Battery charger PU1 datasheet
http://www.alldatasheet.com/datasheet-pdf/pdf/180746/INTERSIL/ISL6251A.html