Apple Hardware Test - no disc available

Hello!
In the last time, i have some problems (USB Hardware fails, doesn´t get recognised; Vent is going up to 5000 Upm when temp of cpu is at 56°C,...), with my mac mini 2.1, so i wanted to run the Apple Hardware Test. But unfortunately, i can´t find my 10.5 discs, which came with the mini and on my Snow Leopard Disc, there is no AHT available. I can´t find a Download (except for much older hardware) and do not want to go to a dealer and pay money for a diagnosis, which can made by myself with the right software.
Can anyone help me with this issue?
Thanks for any help!
Greetings from Austria
Herbert

Greetings Herbert!
Only the Original Install Disc(s) have AHT for that Mac Hardware.
Have you done a PRAM reset, CMD+Option+p+r...
http://support.apple.com/kb/HT1379
In fact, do 3 in a row, takes a bit of time.
Intel-based Macs: Resetting the System Management Controller (SMC)...
http://support.apple.com/kb/HT3964
What to do if your computer won't recognize a FireWire or USB device...
If the issue persists, try these steps:
   1. Shut down the computer.
   2. Disconnect all devices and all other cables, except the keyboard and mouse cable(s).
   3. Disconnect the computer from the power outlet and wait for 3 to 5 minutes.
   4. Plug the computer back in and turn it on.
   5. Reconnect the device(s) (one at a time if there is more than one) and test. Test with each port if you have more than one.
http://support.apple.com/kb/HT1317

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