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Catalina 10.15.1 Doesn't Boot in Normal Mode

Joined
May 5, 2011
Messages
6
CPU
i3-650
Graphics
GT 430
Mac
iMac
First, I installed the new Catalina by direct update from High Sierra.
The system on boot, at 3/4 of booting, had a shutdown in normal mode. It started correctly with boot args -x -v or -x -s, didn't start with only -x.
With -v or -s it started in verbose mode but, I think at 3/4 of booting, the rows of text disappear and shows only few rows at the top of screen, changing continuously......
Then I decided for a fresh install but with the same result.
Could anyone suggest me some solutions about this problem?

Thanks in advance.
 
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