Ps4 drive, power and reject button with no function after cleaning the inside?

Today I screwed my PlayStation 4 to clean the dusty inside, as the Good was loud as a jet fighter. Removal and cleaning worked flawlessly. Also the assembling (apparently) without complications.

Now I'm faced with the problem that the drive does not record any more games, the Powerbutton the PlayStation no longer start / shut down and the reject button has no more function.

what could be the problem? Someone already had the same mistake?

I have not changed the thermal grease (WLP) yet, which I will do tonight. Could it be because of that? What purpose does the WLP fulfill exactly?

if not, should I dare to drive?

I'm looking forward to many answers from you.

Ps.: please answer only serious, even know that such a repair is always associated with risk. Now it is time to save what can be saved.

Take a look at whether a cable is loose or you have hurt one.

Presumably you pulled some plug, or some ribbon cable, and did not plug it in again.

But at least she is quiet when she is not.

The thermal grease only passes the heat from the processor to the CPU cooler and as long as it is a good thermal grease, replacing it actually does nothing. It has nothing to do with your problem.