Fujitsu lifebook T4220 turns on but black screen with lock flash
When I start up my lifebook it powers up but the screen remains black. When you look at the display where the battery is there is a flashing lock.
I have shut down the computer. Taken out the battery. Left the computer off for hours without the battery. Restarted the computer and the same thing happens. This has happened once before but resolved itself immediately.
The computer was shut down while it was loading prior the last time it was started and worked correctly.
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Step 1Reboot or turn on your Fujitsu Lifebook and press "F12" when the Fujitsu logo appears.
Highlight "Recovery and Utility" using your arrow keys and press "Enter." If this options does not appear, you have to recover directly from the recovery disc. Step 3
Select a new keyboard layout on the first screen that appears, if your preferred keyboard is not already selected. Click "Next." Select "Use recovery tools...," and "Next" on the "Operating System" dialog screen. Enter your password, if your system is configured with one. Step 4
Click "Recovery and Utility" on the "System Recovery Options" screen. Step 5
Click the "Recovery" tab and click "Restoring the Factory Image (only C:\drive)." Follow the on-screen instructions to restore your Fujitsu Lifebook. Some models may require a supplied recovery disc be inserted at this point.
The num lock key may be showing you an error code. are the flashes varying in length? or the time between flashes? if so look up bios error codes on Fijitsu web site.
Sounds like a hardware error, at ths level it is possibly a CPU or memory issue. has the laptop suffered a fan failure? or recently got hot?
you could try removing all unnecessary hardware such as cdrom drives and all but one memory sim, and see if that changes anything when powered up.
Turn on as you did before and leave on for 10 minutes. Then, try turning OFF the computer by keeoing the POWER button pressed for 7 secons. If the computer goes off, then your screen is fried and the computer is actually booting up normally... you just can't see it ;)
Unplug the AC adapter from power cord, then remove the battery.Wait 30 min and put the battery back.Plug the AC in power cord and try again.If not start you need check AC adapter with voltmeter.If the AC working your computer need service.