Wired to laptop works, wired to Airport doesn't

Hello
I've been having a fair bit of trouble lately with my Airport Express and I can't work it out. I have a router connected to cable Internet. If I plug an Ethernet cable into the wired router to my laptop I can get the Internet. However, if I plug the same cable into my Airport Express it doesn't see it. I get the flashing amber light and nothing happens.
This hasn't always been the case, up until last week everything had been fine for as long as I can remember.
At first I thought it was my supplier until I realised if I plugged in direct to my laptop it worked ok. So then I thought maybe it's my Airport Express, after a factory reset I have the same issue. And I even have the same issue with a completely different Airport Express.
I just can't work it out. My supplier says if the wire works fine to my laptop then it must be my wireless router, but if both aren't working I seriously doubt that - what are the odds with that?
I'm really confused and my web supplier is no help, they say replace the wireless, but I don't want to spend more money if so far 2 routers have the exact same problem.
Anyone had this? Any help would be really really welcomed.
Thanks in advance.
Dom

When you plug the AirPort Express Base Station (AX) into the existing router, you have (by default) two routers in your network configuration. Typically, you would want to reconfigure the second or downstream router as a bridge. When you reset the AX, it defaults to being a wireless router ... so you would need to use the AirPort Utility to reconfigure it as a bridge. (ref: AirPort Utility > Manual Setup > Internet > Internet Connection > Connection Sharing = Off (Bridge Mode))

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Click the "+" button
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Step 2
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