Resetting a HP laser printer
There is a technique known as cold resetting. Basically will put all of your HP printer settings to factory default levels. It is important to note that any settings made on the control panel of your printer will be reset. Therefore, if you happen to have a JetDirect card then even the IP address will be reset to factory settings. You can try to reset NVRAM. To do this, turn off your HP printer and then hold the 'Go' button for about 20 seconds while switching the printer again.
- HP 1200 and 1100 models reset: To do this, simply change the data by going into service mode. This applies if your HP printer 
has a display panel. Otherwise, hold the 'Start' button for about 5 seconds while the printer is on.
- HP 2100 printer resetting: You must press 'job cancel' key after turning off the printer. Then switch the printer on and only then release the button called 'job cancel. "
- HP 2200 printer resetting: Switch off the printer and then hold 'Go' button. Switch back the printer on while holding down the 'Go' button till the light comes on. Then release the button.
- HP 6P and 5P models resetting: Switch off the printer, and then press the 'reset' button and within 20 seconds turn the printer again.
Resetting a Dell printer
You can reset your Dell printer relatively easily by simply double clicking on the 'Reset Dell Printer' icon. You can reach this icon by clicking on the folder 'UAN', then click on 'System Utilities' and you should find the icon. But a little warning - this method will work if the USB cable is directly connected from the PC to the printer.
Resetting a Lexmark printer
You will first need to turn off the printer. Then simultaneously press the RETURN and READY keys while switching on the printer. This will take you to the Diagnostics Mode. The display will show the message 'Performing self test'. Choose 'Maintenance count'. Reset the counter to make it zero. Then select the RETURN key and go back Diagnostics Mode. Then you can reset the printer to return to normal mode.
Resetting Brother Printer
You have to keep pressing the DOWN or UP keys a few times until you see 'Maintenance 99' displays. So keep 'Set' button to go to standby mode. Note that if you press the exit button after typing in a single digit then the machine goes to maintenance mode in the initial stages.
Resetting Samsung printer
You must press the following keys in quick succession - MENU # 1 9 3 4 So you should see a message on screen says "TECH. 'Then again select the MENU key followed by ENTER. The display will now show' TECH MODE. 'Then select' <'key twice. Your operator panel should show' new ink cartridge. Then select ENTER. Now panel will show [YES]. Select ENTER again. You can exit this mode by pressing MENU # 1 9 3 4 again after another.
