Most common questions used to investigate
Is your amplifier plugged in to an electrical outlet?
Is your amplifier powered on?
Is your amplifier connected properly to your instrument?
Is your amplifier on standby mode?
Is your amplifier volume sufficiently high?
Is your instrument volume sufficiently high?
Are your cables working properly?
Did your amplifier over-heat?
Is your amplifier a tube amplifier?
Common conclusions
Your amplifier isn't working because it is not plugged in to an electrical outlet. Plug it in and try again.
Your amplifier isn't working because it is not on. Power it on and try again.
Your amplifier isn't working because it is not connected properly to your instrument. Connect it and try again.
Your amplifier isn't working because it is on standby mode. Turn off standby mode and try again.
Your amplifier isn't working because the volume is too low.
Your amplifier isn't working because your instrument volume is too low.
Your amplifier isn't working because your cables are faulty. Try using different cables.
Your amplifier isn't working because it over-heated. Try turning off the amplifier, let it rest for ten minutes and try again.
check that all your tubes are lit up and warm and make sure none of them are cracked, cold or look like they are not working. The tubes may have to be replaced in order for the amplifier to work.
Unfortunately, we could not find a solution to your problem. We suggest taking your amplifier to a professional technician for further examination.
References
https://www.fender.com/articles/tech-talk/amp-trouble-try-these-9-simple-solutions-first
https://www.techwalla.com/articles/how-to-troubleshoot-a-guitar-amp
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