It can be one of the PCBs, the motor, and a few other things.
and there are no warning lights., that is likely the harbinger of the no power fault above.. Plug it in and switch it on.

Grasp the power cord a few inches from where it goes into the handle.up and down, side to side and maybe round in a circle.Try twisting it a little left and right.

If the machine bursts into life,.even for a moment.

while you are doing that, then it needs a replacement power cord.
In this case, the cable has broken internally and a new one will fix it.>>Information for Visitors<<.
Sebo Vacuum Bags & Spare Parts in Trafford Park.Here at the Sebo Shop at Manchester Vacs, we carry more Sebo spare parts and have a greater range of bags, spares and accessories than anywhere else in the North.. We have more Sebo spare parts than anywhere else in the North.
We stock not only genuine Sebo bags and spares but also many good quality aftermarket items, some of which are our own exclusive lines such as.our own brand power cords.
(Editor: Affordable Bicycles)