PowerPC G5 will not boot up. HELP PLEASE!!

hi all. i have had my g5 a while now whithout any problems until now. basically i opened firefox & mail & my mac suddenly froze, i couldn't force quit or move my mouse so i had to manually shut it down. whenever i turn it on now it either does two things 1. loads to white screen with apple logo & the fan goes faster & faster like an airplane is taking off & 2. a black screen with the fan going mad. im assuming it's either my firmware nothing more but i could be wrong.
this is what i have done so far. pressed all the keys for commands like ctl-alt-opt-del, would boot from my cd but cd tray doesn't eject so cant try this method, iv cleaned the inside of my g5 getting rid of the dust on the ram's etc.. still no luck any suggestions?
basically i am getting an imac soon so all i am worried about it all my files on my HD have gone. if there is a way of getting to my hd & recovering my files so when i get an imac i can just simply transfer them over.
thanks

thank you for your reply.. hopefully im able to still recover my files from my hd. im from england so i don't think ill purchase that one but i had a look on amazon & is this the same kibd of product? http://www.amazon.co.uk/gp/aw/d/B001A5SK56/ref=aw_d_iv_electronics?is=l&qid=1309 203015&sr=8-1
iv booked an appointment at my local apple store so ill see what they have to say first. if my hd has packed in ill go mad as i would have lost all my music & important documents arrrrrrrrrrrrgh!! im a dj so this would really kill me. fingers crossed my appointment goes well & they tell me my hd is ok

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