System returned to ROM by power-on

What does "System returned to ROM by power-on" mean exactly.

Reload, power loss, crash etc.?
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rochey2009Connect With a Mentor Commented:

It means the switch lost power.
Dragon0x40Author Commented:
Yes it could be the switch lost power.

I just used the reload command and it gives the same message - system returned to ROM by power-on
It also could mean that you have config register misconfigured.  ROM is commonly used to recover loss password.  Do a "show version" and look at the last line for "Configuration Register is xxxx"

Here is the link to Cisco to help you interpret the ConfReg code
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jjmartineziiiConnect With a Mentor Commented:
If someone reloads the router with the reload command it should say:

"System restarted by reload."

"System returned to ROM by power-on" means power loss.
Dragon0x40Author Commented:
My 3750 that I tested on showed "System returned to ROM by power-on" when I used the reload command or just pulled out the power cord.

show version show "configuration register is 0xF"

Which says to load sequentially from nvram and then try flash?

If you write erase does the conf reg go back to factory default?
Dragon0x40Author Commented:
The message you receive may vary with model and ios version.
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