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Try remove the battery and power cord. Then press the power button and hold it down for 10-15 seconds. put everything back in and push power button once. See if this helps it come back on. If not, you may have a bad monitor, backlight, or video output from the motherboard. Hooking the laptop up to an external monitor will help isolate that problem as to what exactly is causing the problem. I hope this helps! :-)
SOURCE: Dell inspiron 6400 laptop screen is blank. When
Hi,
http://supportapj.dell.com/support/topics/topic.aspx/ap/shared/support/dsn/en/tree?c=sg&cs=sgdhs1&l=en&s=dhs&journalid=636B124067FE56AEE040AE0AB6E17070&treeid=0A1C2758D598CCD0E0401E0A55170715&Query=bm8rcG9zdA==&SystemID=InspironI6400/E1505&ServiceTag=B3K0DB1&contenttype=-1&os=-1&component=-1〈=-1&doclang=en&toggle=true&dl=
Here is what you need!!! Click on the Above Link. Follow Each and Every Step!!!
Hope This Helps!!! Please Rate my Response!!! Thanks!!!
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SOURCE: Dell Latitude c640 wont boot in normal but will
Check the device manager to check if all your devices are working properly.
SOURCE: i have a dell inspiron 6400...will not boot..tried
Windows is corrupted you will have to use your Dell Restore Cd to reinstall Windows.The drivers if you have the driver cd will have to be reinstalled as well.
Good Luck
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