In Finder try CMD+n for new Finder window, then try arrow keys to navigate around if you can.
Might try a new admin account...
Reset OS X Password Without an OS X CD...
Starts up like the first time you buy a new Mac, but after filling in all that info again, you should have access to the computer and the other Users & files will still be there... give the new User a different name than an existing one.
Ah, found this I forgot about, of course it won't help if it's not setup already...
Turn Mouse Keys on or off
Press the Option key five times. (You must first select “Press the Option key five times to turn Mouse Keys on or off” in the Mouse pane of Universal Access preferences.)
1 (J), 3 (L), 7 (7), and 9 (9)
Click the mouse button
Hold down the mouse button
Release the mouse button
reset FW bus, same goes for USB reset...
Reset the Firewire bus
If your Firewire or USB isn't recognizing any device. A solution which has worked for some whose hard drive became invisible in 10.4 was simply to follow these four steps to reset the Firewire/USB bus:
1. Shut the machine down.
2. UNPLUG the power lead to the computer and any firewire/USB drive or devices.
3. leave it for 10 minutes.
4. Connect back up and reboot.
Well I tried to reset the bus and that did not work. I basically have a computer that will power up but I cannot use it because the Apple mouse and keyboard will not work on it.
Anyone else have any other suggestions that I can try? I have tried all the ones above and got it going but when I pulled the Apple keyboard and mouse off of it (I was borrowing it from someone) and put the Microsoft wireless mouse and keyboard back on it, the computer puked out again.
This machine is making us a very good door stop right now!
I guess we're stuck then, sounds like logic board or PSU failures.
Any LEDs lit on the logic board?
Can you count the beeps or flashes?
1 beep = no RAM installed
2 beeps = incompatible RAM types
3 beeps = no good banks
4 beeps = no good boot images in the boot ROM (and/or bad sys config block)
5 beeps = processor is not usable
In addition to the beeps, on some computers the power LED will flash a corresponding number of times plus one. The LED will repeat the sequence after approximately a 5-second pause. The tones are only played once.
Note: In this case, a flash is considered to be 1/4 second or 250 ms or greater in length.
LED 1—CPU A: red—contact Apple or an Apple Authorized Service Provider
LED 2—Overtemp: red—contact Apple or an Apple Authorized Service Provider
LED 3—Power On: red—the main power is on
LED 4—Trickle: yellow—Power Mac G5 is plugged into the wall correctly
LED 5—Open Firmware good: green—no problem
LED 6—CPU B: red—contact Apple or an Apple Authorized Service Provider
LED 7—Checkstop: red—contact Apple or an Apple Authorized Service Provider