IMac turns on; no picture

Purchased this iMac in early 2002. Hard drive was replaced in 2007, DVD drive this past Jan 09.
I was on Safari and everything froze. Mouse did not respond, could not log off, nothing. I turned off the iMac manually in the back, waited a few minutes, unplugged the electrical cord from the back, then plugged back in.
Turned on iMac. The little dot in the bottom right corner is ON, and you can hear the unit is indeed getting power. But that's it. No picture, no sound, keyboard does not work (for instance, hitting the CAPS LOCK and nothing lights up).
I am reading other posts and I am thinking perhaps the parameter random access memory (PRAM) needs to be reset.
Is this it? The end? Has the motherboard finally gone?
Message was edited by: pacobell73

Sorry that it took a while to get back to you - I am buried in work.
The machine will operate without RAM in the user expansion slot, because 'on board'-equivalent RAM is installed in the factory slot. Instructions for performing such a memory upgrade for a 17 inch 1 GHz or USB 2.0 model are available here. While the type of memory varies from machine to machine, the process is the same across the iMac flat panel product line.
Specific memory requirements for all iMac models are outlined on this chart.

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Message was edited by: living_guarnerius

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I learnt that a few iMac owners, from my Apple vendor, have the same "problem" that the iMac would turn itself on, by leaving the power supply to the iMac turned on (Here our wall plugs have an on/off switch)
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I did not set any auto schedule to turn on and/or off my iMac.
This seems to be an intermittent problem with the latest range of iMacs, so I was told. And since it has not pose any other (serious) problems that may affect my mac's performance, I just let it be, at least it saves me the trouble and hassle of reaching to the back to turn on the mac, ha ha.
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IMac turns on; no picture

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