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The roms should just pull out right?  The side tag looks pretty standard. This is probably much like the non production 128's sent out to programers.  Mostly like production, but not to get out and have software made.  Didnt know what they were calling it, so no silk screen, its an LC type...

We just keep saying it as no real troubleshooting can occur until that is done first.  Kind of like trying to start a car without a battery.  Nothing is going to happen  until you do that first.

The hinges are plastic so it wont be like the later powerbooks.

the cable is not an issue unless you are taking it apart and such.  If its been recapped its a non issue.

The logic board needed recapping first.  Those caps are always toast on the classic and II.

did you try and force quit safari?  It may be missing.

what OS?  Try putting files on a cd and putting in another computer.

The 4400 is an odd bird.  The person I got mine from had hard drive issues.  He unplugged it (the drive that is) .  I plugged it in and its worked every time I have used it.  But he mentioned the same kind of issues you have.  Maybe its a pram issue of some sort?

its listed as most usual users never updated firmware.  Almost every mac I have ever bought had firmware that needed updating.  I had to update my cube and a quicksilver to get a giga and a sonnet to work and its over a decade old right?

the update once done works for OS X and OS 9 but per firmware says must boot into OS9 to update firmware and such. NOTE: If the Boot ROM Version is earlier than 4.1.9, reboot the system under OS 9. The Apple Power Mac G4 Firmware Update will run only On Power Mac G4 models with AGP graphics...

I had to be on OS9 and have the disk in the actual CD/DVD drive for the updater to run per the read me file.  It goes through open firmware button pressing and the like on the cube, I didnt read the tower section, but it would seem it would be the same.

i have the cd dmg if you need to burn it.  My cube needed the actual disk for firmware updating.

ram could go bad in the plus, and A/B board but as Bibilit said logic board rarely ever sees issues on the plus.

did you replace the 2 capacitors on the inverter board?  that causes backlight flickering.

I started up my backlit, which of course the motherboard was recapped.  Well I did not recap the inverter board as they were radials.  The screen flickered until the mouse button was pressed.  One thing I did not think should effect the other.  But I quickly took the screen case apart, pulled...

Not sure then, might still have cap goo under the sound chip, or a bad trace.  Does the sound port on the back work?

Hard drive space if it was full will limit ram doubler.  Again its strange as macs will say if virtual memory is on.  

the physical speaker.  If you do a search there is already a thread somewhere on this.  In fact it was talked about around 2 weeks ago again.  I pulled one from an LC and drilled out the rivets and put in a newer known working speaker and all was well.

the IIci you can just move the feet to the side as it has holes there also and stand it up like the Quadra 700 its modeled after.  The IIsi is a whole other beast.  Not sure if they made that.

It is weird it doesnt say virtual memory, so it may be anything alse also, say a ram doubler or the like.