MacMini won't accept boot commands - HELP!

My MacMini recently had a fresh Leopard installation. Yesterday it wouldn't open any applications (click icon on dock and it would load the application and immediately quit) so I rebooted the machine. Now it boots, displays the apple symbol, blue screen and then Leopard standard background, the mouse cursor toggles between mouse pointer and colourful circle. Here it stops!
I have attempted to use the boot commands such as Command-T to access it via firewire but it ignores all commands (I cannot even boot from a bootable installation DVD). I have tested the keyboard and it isn't that.
Please HELP!

I had a similar experience where a brand new Mac Mini (Model Identifier: Macmini2,1) would intermittently fail to recognize the pre-boot command keys. Apple support decided it needed a new system board, which it got, but that did not fix the problem.
In this case an Apple aluminum/white keyboard worked as expected at the Apple store.
I was using a PC keyboard and mouse through a cheap PS/2 to USB adapter and the folks at the Apple store were quick to suggest that was the problem, but connecting my keyboard and adapter to another Mini of the same model at the Apple store worked perfectly.
In the end, the 'official' recommendation was to buy a 'USB 2.0 compatible keyboard'.
Well, a plain Logitech ($20 at Fry's) also failed! I decided to return the Mini and buy one that worked!
While carefully documenting the problem, it began working as expected!
It turned out that, in my case, the pre-boot commands only worked if the keyboard was connected to the outside USB port. That's the port nearest the right side of the mini when viewed from the back, under the audio out port.
This configuration has been working now for over a year with the original keyboard and adapter.
Try connecting the keyboard to the right-most USB port.
Regards,
-Glen

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Please repost in the Final Cut Pro forum. Have you considered upgrading your machine, if you are still running Leopard your machine may be as old as 5 years old. While this should not matter you probably won't get the performance you want out of a demanding app like FCP.
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I would appreciate some help with this issue, I am trying to boot up to the Apple Hardware Test on my Install Disk 1 that shipped with my MacBook Pro 2.4GHz Model #A1226 ordered new with 4 gigs of memory (around Aug. 2007). I am currently running 10.5.6 and the install disk of course contains the Tiger OS. I have nothing plugging into my computer, other than the Power Adapter. I have the proper install disk inserted in the computer and am holding down the "d" key on my built in keyboard throughout startup, but it will not go to the AHT. It simply boots to the normal login screen for Leopard. In fact the only boot commands that I see any visible or audible confirmation that it has taken effect is the option key, taking me to selecting a Startup Manager and holding down the Power Button gives me a tone from the internal speaker after a few seconds.
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The intermittent problems I was talking about are very vague and rare so I is difficult to describe them other that just a hunch that something is still a bit off. One is the display, every once in a while, showing what looks like a massive bar code or UPC code on my screen. This is not like the bands with soft edges that seem to be a well documented issue with the early MBP but transparent lines of alternating width and brightness with hard edges. Again it looks just like a UPC code transposed on my screen. The other items are random freezing of the OS or the mouse and the fact that my keyboard does not respond to any but a few boot commands. Again all the things are either rare and intermittent or do not come up in daily use of my machine. But when taken together, seem to add up to the conclusion there is still some issue present (at least in my mind).
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MacMini won't accept boot commands - HELP!

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