Hello @Trojanthulung ,
I assume you are talking about the PWR LED. If my assumption is correct, then it seems that there is a hardware failure with your device. Take a look at the following link for info: https://www.cisco.com/c/en/us/td/docs/routers/access/800/829/hardware/install/guide/b_IR829-HIG/b_IR829-HIG_chapter_01.html#con_1126478
The alternative was that your device is in ROMMON, but you said you cannot access it on the console port. Please make sure your terminal is set to the default settings for the console port on Cisco devices - 9600, 8, N, 1.
HTH
Regards, LG
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