Tried to download most recent apple sw upgrades, now PowerBook won't boot

Hello,
Last night I wanted to watch a video someone sent in an email (that I watched on my G5 earlier), but my laptop needed latest realplayer, so I downloaded that, installed it. Then apple said I needed to upgrade my operating system, I forget to what (I have 3 macs!)...I downloaded about 5 upgrades, one was the latest OS, one was java, 3 others, wasn't paying close attention. But downloads took a while... Wanted to restart, I said OK.
When I went to boot up laptop, I'd hear a beep, then pause, then the apple chime, then nothing, black screen! So I tried again, but this time, held power button down, finally, got a white screen w/ this message, in a tiny font up in left corner. I just tried again, and this is the message:
Apple PowerBook5, 6 4.9 1f3 BootROM built on 07/13/05 at 12:26:00
Copyright 1994-2005 Apple Computer, Inc.
All Rights Reserved
Welcome to Open Firmware, the system time and date is: 12/09/2010 21:12:44
The battery capacity is: 98 percent
To continue booting, type "mac-boot" and press return.
To shut down, type "shut-down" and press return.
ok
0 > _
so I typed mac-boot, and return,
I finally see gray apple on white screen, round cursor spinning below...then two minutes later, apple changed into a circle w/ a diagonal line through it, and round cursor just spins and spins...
I just tried again, and the cursor has been spinning for over 10 minutes...
It is about 5 yrs old, so out of warranty.
Anyone have any clue what's going on? I've been on macs for almost 10 yrs, and have never run into this before!
Thanks,
~Mary

You can't download an OS upgrade. Occasionally you'll see an OS update (such as 10.4.2 to 10.4.3) but if you have 10.4.x and an application says you need 10.5 or better, you have to buy the upgrade in a store. Since the PowerBook G4 uses a PowerPC processor, the highest version of the OS you can run is 10.5 Leopard. (10.6 Snow Leopard requires an Intel processor.)
That being said... no way to know what update you downloaded that caused that problem, but here is a KB article that may help:
http://support.apple.com/kb/TS1892

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