@Adeolu if you mean the ONT unit on a full fibre connection has no leds showing check the power supply is plugged in and that the mains socket is working. If that all looks good you need an Openreach engineer to swap,the unit so call Sky and report the issue.
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65inch Sky Glass, 3 Sky Streaming Pucks, Sky Ultrafast + and Sky SR213(white Wifi Max hub) main Wifi from 3 TP-Link Deco M4 units in access point mode
