When I power on my C 400 Latitude note book, it does not show display. From top panel where ON button is fix, there are 3 LED indicators, LED 4 (Lock "A") blinks 10 or more times but note book does not display. after 15 sec it automatically power off.
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Re: C 400 Latitude display problem
That LOCK A sysmbol is the caps lock.
Most likely its due to hardware failure. Be sure the battery is holding a charge and the power adapter is working.
It could be bad Ram. Usually when there is nothing at all but a quick light on and off and nothing, its due to motherboard issues or hardware plugged into it. Try removing any CD drives or add in devices.
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Screen does not come ON or not showing any display even the power LED is lit. Sometimes it is due to the laptop was not shutdown properly or the battery was drained or laptop was left idle. This is a simple solution that may fix the problem. If the power LED is lit, turn off the NB, remove all the power sources (battery and charger). Without the power sources, hold the power button for 10 secs and put the power sources back and turn ON the laptop. If this doesn't resolve the problem, it needs to be checked for possible Motherboard problem.
Before replacing anything verify that your laptops display type didn't get changed to VGA out only. look at your function keys (usually top one or two rows ) and look for the key that has a pc/monitor icon. with the machine powered up and connected to the external monitor press the function (FN button lower left of keyboard) and the video/monitor button at the same time. most laptops have 3 settings: laptop display only, external display only and laptop and external display. Press the FN/Display button at lease 3 times waiting 3-5 seconds between keystrokes. I have seen this many times where the FN/display button keys are hit inadvertently. Typically if the motherboard or video card fail the external monitor would not work either.
Not sure if it's a sure fix or not, but it worked for me.
I have a DellLatitude c640 and when powering up, the caps LED would blink roughly 10 times, things would spin up, but after the 10 or so blinks, it would power down without anything having been displayed. This happened just after I had the laptop going on batteries, and it went into hibernate mode automatically after the batteries got low. When I plugged back up to a power supply and turned on, the computer started to exhibit this problem.
All I did was removed the bottom panel, removed both memory modules, put the memory modules back in the slot, rocked them at least 7 times before locking them back in to place to ensure a good seat, and completly seated them (clicks into place), closed up the panel, and powered up.
After doing this, the system booted up normally.
Just as a bynote , Faulty RAM, damaged motherboard affecting the RAM (ie cracked RAM slot where it was maybe forced in with a bit too much pressure) and lastly cooking the chip although this is a lot more rare. Easiest way to check is get another laptop and swap YOUR RAM INTO IT if it affects that laptop then RAM, riskier is to switch ITS RAM into yours, still does it - generally MoBo. there are also other problems that cause these errors, but in my experience these are the most common
Good luck! Please rate our solutions and if you still have problems please call back for more ideas to help you
Thanks Richard Scott Technical Support New Zealand
Try connecting and external display screen to your laptop's external display port. If the external display is working, then try to access your laptop display connector (usually can access by removing the top power button access cover and/or the keyboard assembly) to the motherboard and disconnect and reconnect to motherboard. Power laptop back on, if still doesn't work, then could be the display invertor pcb or the actual display. If you have to order a display, make sure the display invertor board comes with it. Hope this helps, Ed.
press the fn key on laptop hold it down and then press the power key on the laptop. once u see any display on the screen you will get some tests running on the screen. The system will show you the error message which u need to note down. else you can do a Flea Power on your laptop. Remove the adapter and the battery and then press the power button and hold it down for 30 seconds then connect the battery and adapter back and try to turn on the laptop. See if the magic works for you
Try taking out battery and plug in power. If it works, battery is faulty. If not, Try taking out your hard disk plug in power, if it works, hard disk is faulty. If not, Try taking out memory card, if there's a sound, memory card faulty. If no sound, it's your motherboard that is causing the error.
Note: If machine is under warranty no need to pay for the repairs.
Try connecting an external monitor to the Dell Latitude D820. If the monitor display is fine, then your laptop’s LCD display panel is defective. If the monitor has no display, then your problem is with either the video card or motherboard located inside your laptop.
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