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this time your DELL LATITUDE is hang-up, why because the motherboard find some devices connected which are no longer exist... Here's what you do for now, remove the jumper switch to reset the cmos setting to clear and back to normal, you can see jumper very near to the cmos battery... if the problems exist again tell me how many numbers of beeps.. heres my email: email@example.com...
I have found a few things with this model, first if the laptop works on ac power when the battery is out then try pushing the button on the battery itself and see how many lights light up. If they are not green replace the battery it just wore out. Second if you can wiggle the power cord and you see the charge light flash on and off then the solder joints are cracked on the main board and you will have to take the main board out of the case and drill out the 3 rivets on the metal bracket covering the plug and bend it out of the way then there are a small brown and a small black block near the plug resolder the ends of these facing the plug. bend the bracket back into place and epoxy it where it was. put the main board back in the case hook all the stuff back up and now it will charge your battery. If you are not good at this stuff I would not try it yourself. I have fixed 2 c640s this way and it is slow careful work.
Something to try would be to re-seat the ram and harddrive.
just take them out and then put them back in and try again. I would try with the battery out and just the ac power plugged in.
Being that it was bought off eBay, realistically it probably got banged around a little bit. Sometimes if one of the devices are not making a real good contact it can cause these problems. I have also seen bad batteries cause this problem.
This is not necessarily going to fix your problem, but it has occasionally worked for me in the past and it is a very quick and free thing to try.
if its the battery with a press button that lights up 5 green lights.. if u hold it for about 6 seconds it should light up all or some in a row like 000.. ( depends on charge it has) after 6 seconds none should flash , they should turn off . if any do flash or led green are missing in between its likely a bad battery.