If you are sure you're using the correct AC adapter, then there may be a myriad of problems that could have occurred. The most likely explanation is that the motherboard is fried or a component short circuited somewhere. If you're lucky, its only a cracked solder point or a broken plug for the AC adapter. If you have the expertise you can open it up and try to find the issue. If the red light isn't coming on, then its either a power issue or a switch issue with the on/off function.