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If your laptop appears to boot up and the hard disk LEDflashes, then the problem is probably a back light fault. This can be a faultyinverter or a faulty CCFL lamp. Please click on this link and follow myinstructions to identify the fault and possible fix :-
It might be setup to go into sleep mode if it is left idle for a certain period of time. To change the settings click the following(I am assuming you have windows vista or windows 7): Start,Control Panel,Power options,Choose when the computer goes to sleep(look on the left side),Then adjust the settings to what you wish by clicking the black arrow there. Also check the "choose when to turn off the screen" in the same spot you clicked Choose when the computer goes to sleep.
The cable connecting the motherboard to the screen might have a few open wire. It's why the problem occur when you move the lid. download the service manual to have access to this cable (HERE: : http://www.elhvb.com/mobokive/edwin/laptops/Dell/LATITUDE/C510-610/C510-610.PDF) Unwrap very gently the cable from is sticky tape and you should find a dozen of very small wire, one or two might need to be reconnected together. Or You might also have a problem with the VGA card, in that case your only chance is to find a replacement one on ebay, or if the VGA card is integrated to the motherboard, then....live with it. You should find all the details on the service manual. Good luck tell me if it did solve anything, and please rate.. cheers
This is a problem with the BIOS of your laptop. You can do a BIOS upgrade by downloading the updated BIOS from the laptop manufacturer's website. If you close the lid and your laptop goes to sleep mode, your downloads will be halted since you system will go on to power savings-mode (most nics are disabled during this mode). What you can do is let your laptop sit during downloads but change the power savings mode to always on (RC on desktop>properties>screensaver>power>power scheme is always on).
I've seen this on many Dell machines, and I've found no real fix for this. It seems that this function either works or it doesn't. You can do a restore back to a point that you remember it working properly, but eventually it will start doing it again. I've decided that this is a glitch with Dell's systems. You can also do a bios update from Dell's support site, sometimes this helps with the little glitch they pick up.