Imac won't turn on and gives me 3 beeps

Ok - I am completely clueless here. My father's iMac - left overnight in sleep mode - won't turn back on. I held down the power button and waiting for over a minute, then turned it back on. It gave me 3 loud beeps and won't turn back on - the power button light flashes green and yellow. Anyone have any ideas what is going on and if this is fixable? HIs computer is an iMac G3 333mhz (I think)
Odd things that have been happening the past month or so: Safari browser gone out of whack - graphic / text loading funny - Switched to Firefox. MAIL started yesterday acting weird. Usually left open, but with the window closed - was unable to open window. When I selected new message window I would get a new window the folders wouldn't show, nor would the toolbox on top. Had to go to the menues and have them show. But then I closed this window, another window, without these feature would appear and I would not be able to close it at all. Finally had to delete the preferences and add the email accounts info again for it to work again properly.
I have no idea if this was telling me that something was starting to be wrong with the computer. I just took it that my father did something he wasn't suppose to do (He is really computer illiterate and can only do basic stuff on the computer when he's alone)
I hope he hasn't lost his computer completely - I don't want him having to use MINE (for the reasons above!)
Any help would be greatly appreciated!
Rebecca

It may be marginal or defective memory that's causing the problem. This Forum is dedicated to the older CRT-screen iMacs, so I'd suggest that you post a new topic describing the problem in this Intel processor-based iMac Forum.

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Imac won't turn on and gives me 3 beeps

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