Frozen iMac after reboot

Hi everyone,
I need some help please. My iMac froze while trying to download some photos. I held down the power button to force reboot and at first it just went in to sleep mode. Then it finally reboot but was still frozen. I tried it again, and this time made a loud ringing noise for about 5 seconds and then it reboot but still frozen. I am not sure if I need to try in single user mode or safety mode, but the computer doesn't seem to respond when I try. Any suggestions
Thank You!

Try to boot into Safe Mode by holding down Shift key and press power button to turn it on. Hold down the Shift key until you see a grey screen.
reset PRAM, instead of holding down Option key at startup, hold down Apple(Command) key + Option key + letter P + letter R keys and turn the computer on, holding down those keys until you see a grey screen or a couple beeps then let go.
Try to boot from Mac OS X disk by inserting the disk and hold down C key to boot into disk. Run the *Disk Utility* to repair the disk
If none of this works, you probably try to do a Archive & Install using the Mac OS disk. Just make sure you back up all the files and have applications' original installation disks ready. By performing Archive & Install you will preserve the data files on your machine however applications and other settings will be lost. Therefore you need all the original disks for all your applications you wanted to keep.

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