Help - only see white screen

Have mac mini 2009 with 3rd party RAM and HD installed by a technician. Since this morning, when trying to start the machine, the chime sounds, then there is a white/grey screen. Trying to zap PRAM doesn't work. Trying to boot from install DVD doesn't work either.
Any help on how to fix this greatly appreciated

An applecare guy had the fix.
The mini worked and was tested by the tech after upgrading.
The fix was this:
- disconnect all leads
- push in power button for 10 seconds
- connect power, usb for keyboard, and display lead
- reset PRAM
This worked and I got the system back, but no idea why this happened in the first place.

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Help - only see white screen

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