Dell Latitude Won't Start

I'm working on a Dell Latitude D630 laptop. It has 2GB of RAM, Vista and a Core-2 Duo processor. The problem is that it won't go beyond the power light illuminating for about three seconds in terms of starting. I've tried with and without the battery while plugged in, and with the battery alone with the same results. The battery tester (part of the battery) says the battery is good - 5 lights. I've tested the adapter and it tests good at 19.5VDC and no part of the plug seems to be loose. I've tried to test the DC Power Jack, but because of the coaxial plug-style, it's difficult to be sure the results are valid. My results were that it appeared to be good (got good connectivity front to back using a stiff wire as a probe).

Presently, the laptop is in many pieces. Before I put it back together, is there anything else I can check or troubleshoot? Are there any suggestions for after I've reassembled? Is this just a 'dead' computer?

It's 10:45 Tuesday night (Eastern). I'll wait until tomorrow night at about 8:00 to reassemble the laptop. That way I'll have time to try any recommended troubleshooting while it's disassembled. I'll be available for the next couple of hours, then starting late tomorrow afternoon. Please excuse any lack of response during the day, tomorrow. I may acknowledge posts, but won't be back in my shop until about 5:00 or 6:00 to perform troubleshooting.
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nobusConnect With a Mentor Commented:
here my laptop troubleshooting guide :
- if no display - test with an external monitor
- test if it runs from battery alone, or from AC alone
- test also with a known good battery !
- remove battery and AC adaptor, hold power button for 20 sec, connect AC and reboot --> any display ? if NO -->
- disconnect all disk and cd drives, battery , and other cards and peripherals, leave only 1 ram stick
- boot -->any display ?
- if NO remove all ram and reboot --> if NO beeps, mobo or cpu bad ; if it beeps, replace ram stick
-if you can access the bios battery, remove the battery, AC, and bios battery for a minute to reset the bios
or test it, it should read 3 V
*** you can test the disk on another pc, if you like !
mummer1Author Commented:
Hey nobus, thanks for the response.

I've had the Dell logo show up once. Since then, nothing happens on the screen since it really never starts up.
It's been tested with and without the battery.
Sorry, no 'known good battery'. The battery I have indicates that it's good. Is there another way to test the laptop's battery?
I've grounded the MB by removing the battery & adapter and holding the power button. No difference. Will try it again after I reassemble.
*The next couple of items I'll try tonight after reassembly
Because of the laptop's design, the BIOS battery is presently disconnected from the MB. After I've reassembled, the BIOS will be reset. I'll check the BIOS battery's voltage before I reassemble.

I'll have more info later tonight.
mummer1Author Commented:

It's fixed. I get a feeling that what fixed it was the reseating of all the parts of the laptop; one or more of those parts actually needed it.

Since it started working while I was performing your troubleshooting, not to mention the fact that you were the only respondent, you get the 500 points. Congrats.

Thanks for your help.
>>  Is there another way to test the laptop's battery?  <<   test it with another similar Laptop

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