We have an iMac 21 inch 2009 model. Screen is black upon switching on although we hear the sound. Any fixes for this? Thank you

We have an iMac 21 inch 2009 model. Screen is black upon switching on although we hear the sound. Any thoughts and/or fix? Many thanks

2009 iMac?  You posted in the iMac (PPC) forum. Your iMac is an Intel.
Try Resetting your Mac's PRAM and NVRAM
It really helps to tell us which Mac OS X you have installed...

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