Hmmmmm........sounds like an interesting one. Also, sounds like a hardware issue to me.
The bit of your post that worries me is:
Quote:
For second option I try to "reinstall Solaris 8" using the "original CD's" but when the CD Boot and I select the language and Keyboard, the system tru to launch a window manager but the same error appear "/usr/openwin/bin/xinit: Server error". So, I can't reinstall all the system to Smilie
Windows won't launch unless it can address ALL the devices it uses; graphics card, monitor, keyboard and mouse.
I'd be inclined to power down, unplug and re-plug any all of those devices. I'd be giving the mouse a long hard look.
If you have another system, borrow devices from that one until it will boot from installation media. You don't need to proceed with any re-installation after you've determined what the problem is.