Tdi Won't Start

[Shabazmo]

My diesel 1.9tdi with AFN decided not to start this morning. The engine turns well but will not fire. Also the engine management light or glow plug light won't come on for a second when the ignition is turned on. I checked the fuses, all ok. I plugged in vagcom but it cant find the engine ecu. I assumed that perhaps power to the ecu was misssing, ecu problems or even a relay. I then smacked the side of the dash to the right of the fuse box and the glow plug light came on and the car started instantly when I turned the key. Its been ok all day, but what bothers me is what was the problem. Any help would be grateful.

[seatkid]

A few people have reported broken wire(s) to the fuseholder(s) and relaybase(s). Also poor connections to said relays.