ASUS Wlan router, model  WL-500gP (v1) from ~2008 with all leds for ethernet 1-4 on.
Reason: Faulty powersupply.

Replaced with another power supply, and it booted up just as normal. 5V/2.5A with postive tip (12.5w max) with original powersupply.

Unit also updated with OpenWrt, Backfire 10.03.
Asus firmware update utility is available from www.asus.com

Another one with a similary story is available here: http://hype-free.blogspot.com/2010/03/fixing-dead-asus-wl-500g.html


Powersupply: Original   UMEC  UP0181B-05PE     Replaced with 2.5A/5volt or 3A/5Volt.