I got a dell 640 but it does not turn on, it

hi,

i have two c640s here with HAD the same problem..
turning off after a few seconds..
it;s a voltage ic-chip..the u45 chip..

type in at google:

c640 shuts down

the site with the solution is:

www.asklaptopfreak.com

i fixed my two c640's with replacing the u45 chip with a chip from
a dead c610 and a dead c600
the 2 c640s are happy and in the air for about two months now , so i am very happy with it!
good luck!

The first and easiest thing to check first is the memory. I have seen alot of Dells that the memory burns out and will not let it come on. Try Pulling the memory and replace 1 chip at a time and try it. Good luck and have a great day.