If you have not done so, connect your PC direct to the modem via an Ethernet cable to check the connection from the ISP. to check your modem, and to check the PC as lighting could have also affected the modem, the PC, and even the line from the ISP. If all is good then back to the router. Some of the DDWRT flashes do not allow for the router to be set back to the original firmware. Hopefully that is not the case for you. Others have reported that they have had to try and install the firmware multiple times before it would take on bricked routers. Others were not so lucky. Do try some factory resets. Try another power adapter of the same voltage and amperage although it is best to always use the one that came with the unit. Replace any surge protectors and UPS that you are using. If lighting got to your router it may be time to get a new one. DDWRT and other firmware replacements may help in some cases and other cases it does not. I look at them basically hacks created by hackers.