If your AC is completely unresponsive — no display, no sound — it's usually a simple power issue. Check 4 things before assuming it's broken.
See if any of these signs match your device — each one increases the likelihood of this fault.
These are the causes we encounter while repairing AC won't turn on at all — ranked from most to least common.
AC's breaker has tripped
Plug not properly seated (for plug-in units)
Internal fuse blown in the indoor unit
PCB transformer failed
Main board (PCB) completely burned
Loose connection in the inter-unit cable
Any of the following = a danger signal — call now and don't try to fix it yourself.
On-site diagnosis, clear pricing before any work, and a documented 6-month warranty.