Help! Installed new RAM and now screen isn't coming on!

Hi
I'm in a bit of a mess and would be grateful for any help with this one:
I have a Powerbook G3 500mhz Pismo that currently has a 512mb card in the top slot (Kingston PB100/512) that I installed about two years ago with no problems and an original 128mb in the bottom. At Christmas I bought another 512mb for the bottom slot – (Kingston KTA-PBG4/512 - This one is smaller than the first but it was the one reccomended by Kingston on their website for the Pismo).
I have just got round to installing it after backing up my system and I have good instructions on how to do it (I have replaced the HD two years previous with no problems)
Firstly I have to mention that just before I changed the RAM the laptop fell from a small stool (about 1.5feet high) onto carpet due to the unbalancing effect of taking out the battery/CD ROM. It landed on its edge where the power socket is. I immediately put it back together and turned it on to make sure it was ok - it came on fine and there were no problems visually, mechanically or otherwise, so I carried on with the installation.
I installed the new 512mb card in the bottom slot and re-assembled but when I turned it on the screen remained black! From the computer itself, however, it sounded as if it had started up ok – there was the chime and the familiar sound of the hard drive at start up.
To troubleshoot I removed the new RAM card and put back the old RAM as it was – this made no difference. I checked to see if the processor board was firmly in place or if I had dislodged any connectors by mistake within the area that I had worked but this made no difference. I also tried to re-set the parameter RAM and this made no difference.
Because the laptop took a small knock prior to installation, I am not sure if that has caused something to come loose or damage of some kind but as I mentioned I did test it immediately and it worked, so it’s either a delayed reaction or the new RAM card has caused it. – (As mentioned there is a difference between the two 512 cards in both name and size but the smaller size of the newer one I assume just reflects advancement in technology and it was reccomended by Kingston!)
If anybody has any advice on this I would be very grateful (and also, if anybody can point me in the direction of instructions on how to take the pismo apart to get to the connections to the screen that would be great – in case I have to do it)
Many Thanks Barry
PowerBook G3500mhz Mac OS X (10.3.9)

SpottyFox,
It sounds like you are properly seating the CPU card from your description, so I don't believe that is your problem. I am glad you checked the pins (I should have mentioned that as the next step if the reseating did not help). I cannot answer whether anything was damaged from your description of the pins; I have read where others have realigned bent pins with success so maybe your mileage will vary.
Start up your Pismo, then shine a flashlight directly into the display; if you can see data being written to the display, just the backlight is refusing to light. If this is the case, check the inverter board connections. The inverter is under the clutch cover and powers the fluorescent backlight in the display. Enlarge the bottom picture in this link to see the inverter:
http://www.ifixit.com/Guide/Mac/PowerBook-G3-Pismo/Inverter-Page-10-Inverter
Check connections at each end of the inverter. Disassembly is not as extensive as this guide suggests. Support the back of the display, then remove the main battery, optical drive, lay the keyboard on its face on the palm rest, heat shield, and clutch cover...that's it.
http://www.ifixit.com/Guide/6.0.0.html
You might also connect the Pismo to an external display; failure here would suggest a more serious problem.

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