You could run the machine in safe mode if it does what you want.
I'm just at a standstill at what to do next. I've tried re-installing the operating system, no luck.
If you confident in you have all your needed stuff backed up, I'd go for a clean install. That is erase your harddrive. Re-install the OS.
You may want to make a second copy of your data.
Here are two utilities for making a complete backup of your internal hard drive. I've recommend using one of these so that you can create a bootable system on your external hard drive. ( PPC require a firewire connected drive. ) Once created, you can run your system from the external drive. Hold down the option key on your keyboard then power on your machine. This will bring you in startup manager click on the drive image you wish to boot then click on the arrow key to the right.
"Clone, synchronize, backup. Schedule and forget it."
http://www.bombich.com/software/ccc.html
"SuperDuper is the wildly acclaimed program that makes recovery painless, because it makes creating a fully bootable backup painless."
http://www.shirt-pocket.com/SuperDuper/SuperDuperDescription.html
The startup manager will list all of your bootable partitions then give you a choice of which to boot. Hold down the option key then power on. Continue holding down the option key until you see the startup manager. This brings up the startup manager. Click on your hd or disc. Click on right arrow key.
You need an external Firewire drive to boot a PowerPC Mac computer [ a few G5's will boot from USB ].
I recommend you do a google search on any external harddrive you are looking at.
I bought a low cost external drive enclosure. When I started having trouble with it, I did a google search and found a lot of complaints about the drive enclosure. I ended up buying a new drive enclosure. On my second go around, I decided to buy a drive enclosure with a good history of working with Macs. The chip set seems to be the key ingredient. The Oxford line of chips seems to be good. I got the Oxford 911.
I'd give OWC a call. 1-815-338-8685.
FireWire 800 + USB 3, + eSATA
&
save a little money interface:
FireWire 400 + USB 2.0
This web page lists both external harddrive types. You may need to scroll to the right to see both.
http://eshop.macsales.com/shop/firewire/1394/USB/EliteAL/eSATA_FW800_FW400_USB
(2) FireWire 800/400 Ports (Up to 100MB/s / 50MB/s)
(1) USB 3.0 Port (Up to 500MB/s / 60MB/s)
(1) eSATA Port (Up to 300MB/s)
Has a combo firewire 800/400 port. Not sure what this is. Looks like you will need 400 cable.
http://eshop.macsales.com/shop/ministack