AFTER UPDATE GREY SCREEN NO SOUND THEN SHUTS DOWN AFTER 30  SECONDS PLEASE HELP

AFTER UPDATE GREY SCREEN APPEARS WHEN POWER BUTTON PRESSED NO START UP SOUND THEN SHUTS DOWN AFTER 30  SECONDS AND REPEATS ITS SELF PLEASE HELP

As for now, only thing that helped was an archive and install with preserve user settings. Seems after the reinstall of 10.4. everything that was weird has become normal again. I hope very much this state stays on for a while - or ever!
A comment to everybody: with problems that are common you get a lot of help from friendly users in here, but if like in my situation things get a bit more uncommon than the usual querks and troubles your bound to go through a whole workflow of tests and algorithms - i did learn some new things but eventually I had to go for the ultimate - the reinstall (of course, erase and install would have been more work.) and it's frustrating not to find out how it came to this problem. I wish I could nail it down to something I did mistakenly - i guess I'll find out next time.
THANKS THOUGH to those who replied.
Keywan

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