The slimmer version of the bulkier ThinkPad T420. The T420s is notable for its lower battery life and noisier fan compared to the original T420 laptop.

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My laptop isn't displaying anything. Why?

I have a Lenovo T420s. One night it suddenly shut off (I suspected that it died) and so I put it up for charging overnight. The next morning it would power on but the display wasnt working.

The lights would cease besides the bluetooth one and a sequence of beeps would sound (beep and a pause then 3 beeps then a pause then 3 beeps again and a pause and finally a beep) and then the bluetooth would stay on but the beeping would stop and I could hear the system running. The display didn't come on.

I've tried quite a few things

- the 60 second power button fix (didn't work)

- F8 + shift + power (didn't work)

- FN + F5 (didn't work)

- Attaching it to a monitor to check if there is any problem with the display (didn't work)

- Taking out the RAM slot and powering it on (didn't work)

- Checking for any faint lights on the screen (none)

I am also planning on disassambling it and leaving it for 12-24 hours and reassabling it which I will attempt tonight.

If that doesn't work the only conclusion I have is that theres something wrong with the motherboard. But I'm not sure what? If anyone could help it would be very appreciated !

Answered! View the answer I have this problem too

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Reseat Battery and Cables

1. Shut down the laptop and close the LCD screen. Remove the AC power cord and other cables from the laptop. Flip the laptop over and remove the battery pack.

2. Use an eraser to clean the metal contacts on the battery and the battery bay. Remove any tarnish or build up that may appear on the contacts. Blow the excess eraser bits from the battery and the battery bay.

3. Reinsert the battery into its bay and reconnect the AC power cord and other cables. Ensure that the cable connections are tight and that you lock the battery in its bay.

4. Power on the laptop and check to see if you can see an image on the display.

Reseat Drives and Memory

1. Shut down the laptop, unplug the AC adapter and close the LCD screen. Flip the laptop over so that it is upside down.

2. Locate the cover for the memory module. On most laptops, the memory slot cover has a small icon picture of a memory stick or label. Remove the screw that holds the cover in place with the Phillips screwdriver.

3. Insert your wrist into the loop of the antistatic wrist strap and clip the other end to a metal surface.

4. Unlock the clips that secure the memory module in its slot. Remove the memory module and reinsert it into the slot. Push the module down until it snaps into place. Replace the memory cover slot and secure with the retaining screw.

5. Locate the hard drive cover and remove the retaining screw. Remove the hard drive and reseat it in its slot. Do the same for the CD/DVD drive of your laptop.

6. Reconnect the AC adapter to the laptop. Power on the laptop and check to see if an image displays on the screen.

Check With Spare Monitor

1. Shut down the laptop and disconnect the AC adapter.

2. Connect the monitor cable from a spare external monitor to the VGA or DVI video out port on the rear of the laptop. Plug the power cord into an available electrical outlet.

3. Power on the laptop. After the LED lights on the laptop appear, or you hear the hard drive inside start to spin, press the “Fn” key combination that sends the display to an external monitor. On most laptop keyboards, there is a small icon picture of a monitor symbol. Press the “Fn” key and the key with the monitor symbol a couple of time to see if an image appears on the external monitor. If an image appears on the monitor, the problem is with the LCD screen of the monitor. If no image appears on the monitor, either the video card or motherboard in the laptop is probably defective.

If this solution is not working for you then please let me know.

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THANK YOU!!! The first method worked!! I've been up all night trying to find a fix, and I can't believe it worked! Thank you again!

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Your Welcome!!

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