My Dell Latitude C840 works only with one memory module

> try to go to touchpad properties,you will be able to see there an option for tapping,you will be able to see there an option where you can turn off tapping while typing

was it new ram you bought or was it out of some other machine because it might be a caes of bad ram. try your old ram in the laptop and see if it boots up if so then get your ram chaged.

there is a problem with your sound card.... contact your nearst dealer...check ur sound card...




please vote for me...im sure this will solve your problem...

sounds like a bad driver-can you boot into safe mode? how about the bios?

If you are getting lines on an external display, then the video card needs to be reseated or it is bad. Since you just had it worked on, I'd take it back and tell them you aren't satisfied (most places will guarantee their work 30 days).

The 3 LED's (Num Lock, Caps Lock, Scroll Lock) are used by Dell to diagnose no-post issues such as yours. The only error code close to yours is [Num Lock ON, Caps Lock FLASHING, Scroll Lock ON]. This indicates a a memory error. Try reseating the memory modules. If you have 2 memory modules, insert one at a time to determine the faulty module.

Sounds like you've got a memory issue, sometimes when the computer is working with complex memory calculations the module dumps the data on the stack and poof reboot. Try a newer memory module? Also go into bios and see what options you have for memory processing, depending on age of laptop you might be able to disable the ALU in the CPU but it sounds like a memory issue.

ALso try reinstalling direct X, and even possibly windows itself.

Modem driver, consult mfg.

what is your os?

pls check your power supply