Latitude C640 turns on but freezes

Question

Hi, i got a Latitude C640 laptop and it worked fine for some time, until one day i turned it on (apparently it was on): there was a flashing light,and then fan started working but the screen was black, and then it turned off. If i keep my laptop cold it wud turn on and when it booting a liveCD it freezes in the middle. I thought it was overheating but the keyboard was not hot. My friend said it was like a Thermal Problem. But i dnt know. Did anyone have like the same problem as me? Will i be able to fix this because im not goin to bring it to a repair place? thnx in advance! --ichimeno--

AussieChris · Answer

Hi,   It could be a MBD fault, run the Diags and see if you get any errors. It also may be worth reseating the memory and CPU, I doubt that will be the fix, but it cant hurt and is then one less thing to try later.                                                                        Regards Chris

ichimeno · Answer

Hey Chris.i cnt seem to run the diags cuz my pc wont even start up anymore. How can i reset the memory and CPU?

AussieChris · Answer

Hi,   Reseat means take out and but back in. Check the manual. the CPU is under the KBD top RHS, the memory is under the door on the bottom. Without seeing it, the MBD sounds like the most likely cause. Try the reseat, then try to boot with an external screen. Repost with what happens when you try to boot, what LED's come on and how long.                                                                             Regards Chris

ichimeno · Answer

ok i will try to do that, but i think its a fan prob because when i boot up, i can barely feel the air from the fan..ill try to un clog that too

AussieChris · Answer

Hi,   The fan only comes on when needed, if running you can test it with the Diags. If the fan has failed, the CPU could have been overheated and damaged. It should shut down though, so I would still try a reseat.                                                                      Regards Chris

ichimeno · Answer

yea ill try reset now...im reading the manual rite now. anyway hope it works because my other computer's graphic card cooked and i cnt get a new one cuz i have no money

ichimeno · Answer

Hey, i reseted the memory and the mini PCI card, then tried booting up again but theres still the prob. the caps light turns on and off and on and off and then the computer shuts off. there was nothing on the screen Message Edited by ichimeno on 09-03-2007 10:23 AM ok i got it to boot up once and after the BIOS i pressed F2 and this is wat i got on the screen: memory write/read failure at 3FFF0000,read FF10FF0 expecting FF10FF10 memory address line failure at 3FFF0000,read FF10FF10 expecting 00000000 lol u know wat this message means? -Ichimeno-

Message Edited by ichimeno on 09-03-2007 10:56 AM

AussieChris · Answer

Hi,   The caps lock light is a sign of memory trouble. As is the message. You can try the other socket, you can use either as you dont have to use slot ' A ' first..                                                                          Regards Chris

ichimeno · Answer

Hey, so i took one Ram bar out and it worked so far. i ran the diags: it said memory was good but then it said something about poping in some cd but i canceled that. so i game the pc a test try and tried installing Suse Linux. So i was installing it, it all worked well until in the middle of the installation, the pc froze. and im back at the same problem i had. the only solution i found is reseting the memory and then it booted up but then it froze when i ran a liveCD. well thats wat happens when i do it over and over. Message Edited by ichimeno on 09-04-2007 08:37 AM is that suppose to happen? or like is the pc like permenentaly broken?

Message Edited by ichimeno on 09-04-2007 08:37 AM

AussieChris · Answer

Hi,   Try combinations of memory stick and socket. It still could be a MBD, but rule out what you can.                                                                    Regards Chris

ichimeno · Answer

yea i did that but it still has the problem...im thinking of buying some new ram for the laptop. um wat the MBD mean?

AussieChris · Answer

Hi,   MBD is motherboard, the most expensive part.                                                                               Regards Chris

ichimeno · Answer

so im suppose to buy a new one and replace the old one with it?

AussieChris · Answer

Hi,   It could be the MBD, but try combinations of memory and socket. Some people have found by jamming some cardboard under the mem. stick will let it make good contact. If you need a MBD, it wont be cheap, so you want to be sure.                                                                          Regards Chris

ichimeno · Answer

lol thank you Chris. i shall try the cardboard thing mmm when u mean stikin peice of cardboard under mem stik like how does it help the mem make contacT? how do i stik it under..like so that i really have to press the mem in? Message Edited by ichimeno on 09-07-2007 10:19 AM ello...am i doing this right? heres a pic of it.. http://img158.imageshack.us/img158/7509/vacances2007ng3.jpg btw the thing i circled in red, is the the MBD?

Message Edited by ichimeno on 09-07-2007 10:46 AM

Locked Topics – Laptops General

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