Hi, please can you help me with this problem?

RB450G S/N:279601A22E99/101

Suddenly stop working.
1. After power on, doesnt beep, only a blue diod is on.
2. Lan LED doesnt blinking
3. On console port is nothing
4. Reset button and resset hole doesnt work

Do you have any suggestion what should i try?

Replace it, is broken

Thank you.

Probably the input capacitors have leaked. You may try to replace them if you know how to use solder tools.