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Mac Mini won't boot after PRAM reset

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My mac mini has been running very slow, VERY VERY SLOW, then it would seem it would catch up with itself and run fine for a few minutes, then slow down again. It got to the point where I would have to do hard resets, but it still wouldn't work all th

My mac mini has been running very slow, VERY VERY SLOW, then it would seem it would catch up with itself and run fine for a few minutes, then slow down again. It got to the point where I would have to do hard resets, but it still wouldn't work all that great. So I read on here to do a PRAM reset, which I did by holding down controloption+PR, and i got a gray screen with a status bar. But now the mac won't even boot up, even when I try safe mode. I turn it on, and i hear the start up tone, and get to the gray screen with status bar, but then it just shuts off. Does anyone have any suggestions?
Message was edited by: akiemele

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From your user guide:
1 Disconnect all external devices from your Mac mini, except the keyboard and mouse.
If you have an Ethernet cable connected, disconnect it.
2 Restart your Mac mini while holding down the D key.
3 When the Apple Hardware Test chooser screen appears, select the language you want
to use.
4 Press the Return key or click the right arrow button.
5 When the Apple Hardware Test main screen appears (after about 45 seconds), follow
the onscreen instructions.
6 If Apple Hardware Test detects a problem, it displays an error code. Make a note of the
error code before pursuing support options. If Apple Hardware Test doesn’t detect a
hardware failure, the problem may be software-related.
If this procedure doesn’t work, you can insert the Applications Install DVD that came
with your Mac mini to use Apple Hardware Test. For more information, see the Apple
Hardware Test Read Me file on the Applications Install DVD.
When prompted, choose the extended test.

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