Ashwin Lewis
The Lenovo ThinkPad T420 is a laptop that has been known to have issues with waking up from sleep mode. If you are experiencing this issue, there are several potential solutions. Firstly, check that the mains lead is not plugged into the computer, as this has been known to prevent the T420 from waking up properly. You could also try pressing the Ultrabay unlock slider on the bottom, or removing both the AC and battery, waiting a while, and then replugging. If the problem persists, it may be due to a faulty motherboard, in which case you may need to contact Lenovo support for further assistance.
How to wake a Lenovo T420 computer from sleep mode
| Characteristics | Values |
|---|---|
| Problem | Lenovo T420 laptop occasionally does not wake from sleep mode |
| Cause | Possibly a faulty motherboard or a driver error |
| Solutions | 1. Press the Ultrabay unlock slider on the bottom. 2. Unplug the AC and battery, wait, then replug. 3. Update BIOS to Version AUCN45WW. 4. Change power settings in Windows to avoid sleep mode when plugged in. 5. Install drivers directly from the Lenovo support homepage. 6. Hard shut down and turn on the laptop. 7. Use the Novo button. |
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What You'll Learn
Try unplugging the mains lead and then waking the computer up
If you're having trouble waking up your Lenovo T420 computer from sleep mode, one possible solution is to try unplugging the mains lead and then waking the computer up. Here are some detailed steps and insights to help you with this process:
Firstly, it is important to understand the context of this issue. Some users of the Lenovo T420 laptop have reported a problem where the computer occasionally refuses to wake up from sleep mode, regardless of whether it was induced by closing the lid or leaving it idle. This issue is not specific to a particular operating system, as it has been observed across Windows, Linux, and other platforms.
In such cases, one suggested workaround is to ensure that the mains lead is not plugged into the computer when trying to wake it up. This means that you should unplug the power cord from the wall outlet or power strip before attempting to wake the computer. It is recommended to turn off the computer, if possible, before unplugging the mains lead.
Once the mains lead is unplugged, you can try waking up the computer using various methods. Start by pressing the power button, either briefly or by holding it down for a few seconds. If that doesn't work, try pressing the "Fn" key or other key combinations you may have set for waking up the computer.
After attempting these steps, if the computer fails to wake up, you may need to take additional measures. Some users have reported success by removing both the AC power and the battery, waiting for a while, and then replugging the power and trying to turn on the computer again. This suggests that the issue could be related to a faulty motherboard or a problematic charge circuit.
While unplugging the mains lead and attempting to wake the computer may not solve the issue for all users, it is worth trying as a straightforward troubleshooting step. If this workaround consistently works for you, it indicates that there may be an issue with the power management or sleep mode settings on your Lenovo T420. You may need to explore further troubleshooting options or seek technical support for a more permanent solution.
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Check your Sleep key is configured correctly
To check if your Sleep key is configured correctly, you can try the following:
First, identify the correct key combination to enter sleep mode. For the Lenovo ThinkPad T420, the default key combination is typically Fn + F4. Pressing this combination should put your computer into sleep mode. If it doesn't, try pressing just the Fn key, as this has been known to work for some users.
If your computer doesn't respond to the default key combination, you may need to change the settings in Power Manager. The Sleep function can be customized, and it's possible that the previous setting was changed.
Additionally, ensure that your computer is configured to wake up from sleep mode. By default, the Lenovo ThinkPad T420 should wake up when the lid is opened, but this feature may need to be enabled or configured in the BIOS or Power Manager settings.
If your computer still doesn't respond as expected, try a different key combination to wake it up. Some users have reported success with pressing the Ctrl key or the power button.
In some cases, the issue may be related to a faulty motherboard or a bug in the Intel Management Engine. If your computer continues to have issues waking up from sleep mode, you may need to contact Lenovo support for further assistance or consider a hardware repair.
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Check your Keyboard control panel settings
If you are having trouble waking your Lenovo T420 from sleep mode, you may need to check your Keyboard control panel settings.
First, open the Keyboard control panel. To do this, type "keyboard" in the Start Search box, and then click Keyboard or Microsoft Keyboard in the Programs list. Alternatively, if you are using Windows XP or an earlier version, click Start, click Run, type Control keyboard, and then click OK.
Once you are in the Keyboard control panel, click on the Hardware tab, and then click Properties. Click the Change Settings button (this step requires Administrator access). Next, click on the Power Management tab and verify that the "Allow this device to wake the computer" option is enabled. Click OK, and then click OK again.
If your computer does not support Advanced Configuration and Power Interface (ACPI), the above steps may not be available. In this case, you will need to press the power button to wake the computer. If you are still unable to resume computer operation, you may have experienced a system problem.
It is worth noting that some users have reported that the issue with the Lenovo T420 not waking from sleep mode is related to a faulty motherboard. In such cases, software or hardware tinkering may not help, and a different solution may be required.
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Try pressing the Ultrabay unlock slider on the bottom
If you're having trouble waking your Lenovo T420 from sleep mode, one possible solution is to try pressing the Ultrabay unlock slider on the bottom. This slider is typically used to unlock the Ultrabay device or travel bezel, which can be found on the bottom of the laptop.
To access the Ultrabay device, you need to first unlock the bay lock latch by sliding it to the left and then pulling out the device. The Ultrabay is a feature of the Lenovo T420 that allows you to expand the capabilities of your computer by connecting various devices. However, in the case of waking the computer from sleep, simply pressing the unlock slider may be sufficient without needing to remove or connect any devices.
It's worth noting that some users have reported success with this method specifically when their T420 had a problematic charge circuit. This issue can cause the laptop to not recognize when it's plugged in, even though it's charging. As a result, the laptop may not wake up from sleep using the typical methods such as pressing the power button or the Fn key.
Before attempting to wake your Lenovo T420 from sleep by pressing the Ultrabay unlock slider, ensure that your laptop is indeed facing the issue of not waking up from sleep. Common symptoms of this problem include the laptop not responding to any input, with the power light blinking indefinitely. Additionally, the keyboard and mouse may show no reaction when attempting to wake the computer.
If you find yourself facing this issue, there are a few temporary workarounds you can try. One method is to perform a hard shutdown by holding the power button for a few seconds, draining the power, and then turning it back on. Another workaround is to ensure that your laptop is not plugged into a power source when trying to wake it from sleep. Unplugging the laptop before attempting to wake it has been reported to work for some users.
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Remove both AC and battery, wait, replug, and restart
If your Lenovo T420 laptop is not waking from sleep, there are a few things you can try. Firstly, check that the power lead is not plugged into the computer, as sometimes the T420 will not wake up properly if it is. If this does not work, try the following solution: remove both the AC power and the battery, wait a while, then replug and restart your laptop. This solution has worked for several users and may indicate a faulty motherboard, as no amount of software or hardware tinkering seemed to fix the issue.
If your laptop is not waking from sleep and the power button is blinking continuously, this may indicate a broken screen. If the fan is not turning on, and there are no lights or other indicators showing that the laptop is charging when the power adapter is plugged in, then your battery may be faulty and unable to hold a charge.
Other potential solutions to the T420 not waking from sleep include changing the BIOS to wake from the Ctrl key, or, if your laptop has an Ultrabay slot, pressing the Ultrabay unlock slider on the bottom.
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Frequently asked questions
Try unplugging the mains lead from your computer and then waking it up. If this doesn't work, you can try pressing the Ultrabay unlock slider on the bottom of your laptop. If this still doesn't work, you may need to remove both the AC and battery, wait a while, replug, and then turn on your computer.
This could be due to a faulty motherboard or a problematic charging circuit.
You can try pressing a standard key on the keyboard, moving the mouse, or quickly pressing the power button.
