Ultimaker 3 / not starting / switches off after sound of fan

[LuGe 0]

After not using my UM 3 for about 3 months i switched on my UM3 this morning. Directly after switching on i can hear the fan running for about a second but the printer does not switch on. 

Any suggestions? 

[CarloK 204]

There are no components in the UM3 that are affected by time, i.e. no batteries or such components.
Is it possible a connector came loose? Was the printer moved around during those 3 months?

 

[LuGe 0]

I left the printer clean and switched off. Neither moved nor any other mechanical issue. 

I will try to open it to check all connections.

[LuGe 0]

All connections are OK, dont know how to proceed... ???

[CapableQuad 10]

Did you check the wire connection to the print head? I have add similar problems and invariably reseating that connection solves it.  You have to undo the two bolts on the top of the print head to get at it. 

[LuGe 0]

Will do so. Thanks.

[LuGe 0]

Solved. New Olimex Board and runs as before.