|It's probably not the mboard or the cpu, and there's probably nothing wrong with the orginal ram, but it might have a poor connection.|
A faulty hard drive, or a dead cmos battery, will NOT cause the computer to not boot at all, or cause it to produce no video, if nothing else is wrong.
A common thing that can happen with ram, even ram that worked fine previously, is the ram has, or has developed, a poor connection in it's slot(s).
This usually happens a long time after the ram was installed, but it can happen with new ram, or after moving the computer case from one place to another, and I've had even new modules that needed to have their contacts cleaned.
See response 2 in this - try cleaning the contacts on the ram modules, and making sure the modules are properly seated:
For a laptop, you must remove both its main battery and AC adapter before you do that.
See your Owner's or User's manual for your brand name model, or the mboard manual for your model if you have a generic desktop system, if you need more info about how to properly remove and install the ram modules.
Ram that works in another mboard , or any ram you buy or have lying around, may not work properly, or sometimes, not at all - even if it physically fits and is the right overall type (e.g. SDram, DDR, DDR2, etc.; PCxxxx, xxx mhz) for your mboard. In the worst cases of incompatibilty your mboard WILL NOT BOOT all the way with it installed, and the mboard may not even beep - the ram has to be compatible with the mboard's main chipset, or in the case of recent mboards, compatible with the memory controller built into the cpu.
The same applies for testing your ram in another mboard - the ram must be compatible with the other mboard - if it isn't, any results of testing the ram on the other mboard cannot be relied upon to be valid.
If you still have the ram that was installed when the system worked fine, try installing just that ram.
See response 5 in this for some info about ram compatibilty, and some places where you can find out what will work in your mboard for sure:
Correction to that:
I found a review dated in 2005 about this series.
How long has it been since you replaced the main battery?
Have you ever replaced the main battery?
You may have a faulty main battery, or a problem that is preventing it from being charged properly.
See response 1 in this:
Correction for that:
The jack in the laptop should move when you wiggle the plug in the jack.
should have been
The jack in the laptop should NOT move when you wiggle the plug in the jack.
"video does not appear at
all or .."
Connect a monitor to the VGA port when the laptop is not running, then boot the laptop - in most cases the video on the external monitor will automatically work.
If the display on the external monitor is fine, there's nothing wrong with the display (video) adapter on the laptop - you probably have an LCD display related hardware problem you need to fix.
See Response 1, 2 and 5 in this: