Lenovo Z470, Z370, Z570 manual Computer screen problems, Puter does not work

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Chapter 5. Troubleshooting

The computer does not return	• If the computer does not return from sleep mode, it may
from sleep mode and the com-	have entered hibernation mode automatically because the
puter does not work.	battery is depleted. Check the power indicator.
	• If your computer is in sleep mode, connect the AC adapter
	to the computer, then press any key or the power button.
	• If your computer is in hibernation mode or power-off state,
	connect the AC adapter to the computer, then press the
	power button to resume operation.

Note: If the system still does not return from sleep mode, your system has stopped responding, and you cannot turn off the computer; reset the computer. Unsaved data may be lost. To reset the computer, press and hold the power button for 4 seconds or more. If the computer is still not reset, remove the AC adapter and the battery.

Computer screen problems

The screen is blank.	•	Do the following:
		- If you are using the AC adapter, or using the battery, and
		the battery status indicator is on, press Fn + ↑ to make the
		screen brighter.
		- If the power indicator is in blinking, press the power
		button to resume from the sleep mode.
		- If the problem persist, follow the solution in the following
		problem “The screen is unreadable or distorted.”
		- Press Fn + F2 to confirm whether the LCD screen has been
		turned off.
The screen is unreadable or	•	Make sure that:
distorted.		- The display device driver is installed correctly.
		- The screen resolution and color quality are correctly set.
		- The monitor type is correct.
Incorrect characters appear on	• Did you install the operating system or programs correctly?
the screen.		If they are installed and configured correctly, have the
		computer serviced.

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Contents IdeaPad Z370/Z470/ Z570 Regulatory Notice First Edition December Copyright Lenovo Contents Page Z370/Z470 Getting to know your computerTop view „ Z570 Getting to know your computerGetting to know your computer Integrated Camera Wireless module antennas Computer displaySpeakers Power button OneKey Rescue system button Thermal management button„ Z370/Z470 Left-side viewESATA/USB Getting to know your computer Combo port USB portRight-side view „ Z370 „ Z470 „ Z570Optical drive Getting to know your computer USB port Front view „ Z370 Bottom viewC d Battery pack Learning the basics „ Connecting to the power„ Configuring the operating system „ Reading the manualsPutting your computer into sleep state „ Shutting down your computerLearning the basics „ Checking battery status „ Charging the battery„ Removing the battery pack „ Handling the batteryUsing the touchpad „ Numeric keypad Z370/Z470 Using the keyboardZ570 „ Function key combinations Learning the basics Inserting a memory card „ Using memory cards not suppliedRemoving a memory card „ Connecting USB devices „ Connecting Bluetooth enabled devices on select models Enabling Bluetooth communications on your computer„ OneKey Rescue system button a „ Volume buttons b~dSpecial keys and buttons „ OneKey Theater button e Efficient thermal dissipation mode Standard modeSuper silent mode „ Thermal management button fPerforming dust cleaning System status indicators Page „ Attaching a security lock not supplied „ Using VeriFaceSecuring your computer „ Using passwords Enabling Nvidia Optimus on select modelsConnecting to the Internet Wired connectionConnecting to the Internet „ Software configuration„ Hardware connection Wireless connection Wi-Fi WiMAXSoftware configuration Hardware connection„ Introduction OneKey Rescue systemOneKey Rescue system „ Creating a recovery discs OneKey Rescue systemOneKey Rescue system Troubleshooting Frequently asked questionsWhere can I find warranty information? Troubleshooting Display problemsKeyboard problems Troubleshooting Password problemsSleep or hibernation problems Computer screen problems Puter does not workHard disk drive problem Troubleshooting Sound problemsBattery problems Startup problemTroubleshooting Other problems RespondReplacing the battery pack Appendix A. CRU instructionsAppendix A. CRU instructions Replacing the hard disk drive Handling a hard disk driveZ370 Appendix A. CRU instructions Appendix A. CRU instructions Z470/Z570 Z570 Pull the tab in the direction shown by arrow d Take out the hard disk drive secured in a metal frame e Appendix A. CRU instructions Replacing memory Appendix A. CRU instructions Appendix A. CRU instructions Removing the optical drive Setup Poster User Guide Trademarks Page New World. New Thinking.TM