Resetting a Cisco IOS device

When you need to reset a Cisco IOS device password/configuration, you need it to boot with the config register set to boot without loading the saved configuration. This register is stored in non-volatile memory. You can set this register in ROMMON or in Enable-privilege config mode in IOS.

Normal boot, read config file: 0x2102
boot without reading config file: 0x2142

ROMMON command to set config register to boot without reading the config file:
rommon 1 > confreg 0x2142

IOS command to set config register to boot normally, reading the config file at bootup:
router# conf t
router(config)# config-register 0x2102

add-apt-repository not installed

apt-get install python-software-properties

nVidia display goes black-and-white

Josh1027 from http://answers.microsoft.com/en-us/windows/forum/windows_vista-pictures/my-monitor-just-went-black-and-white/64018efb-0e7a-4df7-94ac-14155e15c575 posted this:

hey smc i had the same problem and finally figured it out! i had updated my nvidia geforce driver when the problem started. alright here's what you do:

1. open ur control panel, switch to classic view

2. then open the NVIDIA control panel

3. then under the display tab on the right, choose adjust desktop color settings

4. then at the bottom of this screen, move the slider of DIGITAL VIBRANCE to 50%

this should fix it if your problem was the same as mine, hope it helps!

Handy IOS bits

Dynamic DNS: http://nerdy-notes.blogspot.com/2010/07/dyndns-on-cisco-ios.html
Break sequences (case-sensitive!): Ctrl-^, Ctrl-^ then x, Ctrl-], Ctrl-R, Ctrl-C, Ctrl-c
Escape sequence for literal '?': Ctrl-V