Mac turns on, but does not seem to load OS.

A few days ago my 27-inch iMac running snow leopard, would turn on as usual,but would get to the first screen which is typically white. Usually, theapple logo appears seconds later and you can see the spinning icon below itshowing the process of loading in the OS. Generally, this would take lessthan a minute and I was up and running.
However, a few days ago, I turned on the computer, it came up to the whitescreen and just froze there - no logo, no progress icon - nothing. Iwaited for over five minutes and then I just held the power button on the backand it shut down. Tried again, same issue. Feeling a bit nervous, Iturned off the power strip and waited for about 30 seconds and turned the stripback on. I then turned on the Mac, and she fired right up as usual. Was relieved to say the least...
However, it is doing this all the time after each time I shut down. Has anyone else experienced this issue? If so, what did you do to correctit? Or, what might be causing this in the first place?
The reason I am concerned, about two weeks ago, I updated my Flash player;and then yesterday, I get an article from a friend about a Trojan Horse that disguisesitself as the Flash Player update and can affect Adobe apps. This may becoincidence, but it makes me a bit uneasy. Any advice would beappreciated...

I came on here to look for a solution to the same problem, I had read in various places that 800Mhz ram is fine i a 667Mhz system as the 800 is just a maximum speed, also have installed 1 higher speed module in another imac with no problems.
My parents asked me to upgrade the RAM in their mid-2007 aluminium 20"imac and the 800Mhz was slightly cheaper so I thought I might as well go for it. Upon installing the sticks the computer refused to turn on, I then checked online to discover one stick of faster RAM with a slower stick is ok but two sticks of faster DDR2 is unacceptable for some reason. I sighed deeply at my stupidity and the wierdness of this quirk and installed both the old sticks of ram back in the system.
It now exhibits the problem you outlined, power button = lit blank screen, chime sound but no signs of OS loading.
Tried leaving it unplugged for a while to reset PRAM but to no avail, tried holding the power button while plugging the power lead in after reading it on another forum and all this did was add a fan stuck on full power to the list of things it does when I turn it on....
I've broken my parents' imac, help!!

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John
"Jesus M. Salvo Jr." wrote:
>
I think I found out why.
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"Jesus M. Salvo Jr." wrote:
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Per Jessen wrote:
1. java weblogic.version:
WebLogic Server Build: Service Pack 1 03/04/2001 22:05:05 #101616
WebLogic XML Module: Service Pack 1 03/04/2001 22:16:50 #101616
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... Weblogic Server (6.0 Service Pack 1 03/04/2001 22:05:05 #101616) ...
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regards,
Per Jessen
Senior System Engineer, BEA Zurich.--
Homepage: http://homepages.tig.com.au/~jmsalvo/
Public Key:
http://pgp5.ai.mit.edu:11371/pks/lookup?op=get&search=0x51F47D34
Jesus M. Salvo, Jr.
Senior Consultant
PGP PUBLIC KEY:
http://pgp5.ai.mit.edu:11371/pks/lookup?op=get&search=0x39F723FD
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Mac turns on, but does not seem to load OS.

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