I have 6 pc's that have been off for 1 to 3 years (Asus and Gigabyte mother boards). They all have the same problem of appearing completely dead. Multiple power supplies have been tested and work on other computers. The CMOS batteries have been changed. Peripherals have been disconnected. I tried unplugging the PSU and holding the power button to "discharge" ? the capacitors. Some of the MB's have a light which turns on, others don't.
Is there a trick to spark life into pc's that have been sitting around too long?