Losing network connection on desktop computer

[mar53]

Since getting a new hub for fibre optic my network connection keeps going off on my desktop computer, anybody have any idea what's going on ?

[imjolly]

By fibre connection is that FTTC or FTTP?  Is pc connected wireless or ethernet?

[mar53]

It's ethernet connection 

[imjolly]

fibre connection?

[mar53]

Yes that's when problem started when it was changed over to fibre

[chrisjp]

But you haven't said whether your fibre is to the cabinet (FTTC) or to the premises (FTTP). BT confusingly refer to both as "fibre".
Also, when you say your ethernet connected desktop computer loses its network connection (to broadband or to your home network?) does that imply that other devices you have maintain their connection?

[mar53]

The fibre connection is wired in through a hole in the wall to a small white box, I don't know tge technical names sorry, all other devices work on WiFi and not connected to the bt line

[imjolly]

from your vage description do you have something like this

if so are the lights green as shown above?

have you tried using a different ethernet cable from router to pc?

[mar53]

Yes that's exactly what it looks like except the middle cable is grey and I think that would be the ethernet cable, I haven't tried another cable, the one I have was connected by bt engineer 3 months ago

[iniltous]

The cable from the ONT goes to the router , your PC isn’t connected to the ONT but a router port so if it’s only your desktop PC that has an issue the ONT and its cable to the router must be OK , an easy first step in locating the issue is a new cable from the router to the PC , if you got a new router because of the ‘full fibre’ upgrade that installed the ONT (the white box ) change the Ethernet cable to the PC or swap it into a different Ethernet socket on the router , and give it a while to see if this fixes the issue , another easy check is that the cables are all seated securely