Huawei HG8240T5 Optical Network Router (ONR)

Check the light indicator on your device. 

Huawei HG8240T5 Optical Network Router (ONR) No power light
Huawei HG8240T5 Optical Network Router (ONR) Red blinking power light
Huawei HG8240T5 Optical Network Router (ONR) No PON/internet light
Huawei HG8240T5 Optical Network Router (ONR) Red PON light
Huawei HG8240T5 Optical Network Router (ONR) No LAN light