No bootable device error after cleaning

I bought this MacBook Pro used. Everything was great except the keyboard which had some signs of water damage (it pressed random keys, some keys weren’t working, it double typed).

So I decided to clean out the keyboard and whole laptop. Before the disassembly, I messed around with Bootcamp (not sure if it’s important).

Everything went great, but the backlight film had a big coffee stain on it. Anyways I took out the keyboard and put it into my ultrasonic cleaner filled with distilled water. It spent there like 2 hours and then it was drying for like 7 hours. I made sure that the keyboard was fully dry.

I reassembled everything together. When I turned my system on, it showed a white screen (no chime) and went to this screen “No bootable device — insert boot disk and press any key“ keyboard was not responding except the power button. I tried holding the alt key, resetting PRAM, SMC, but nothing worked. I took out the hard drive but still, it is showing this.

It appears that the machine is stuck in some sort of BIOS mode or something. Is there anything that I can try before replacing the keyboard? Also, the external keyboard does not work either.