My pc have a sempron 3400+ sse sse2 sse3 .

I've download tiger 10.4.8 jas for amd and intel.
i've intall it in a 30g hard disk
than, when i restart , appear tHe white screen with the apple and under a circle..that round, but than appear.. no signal.. and all black....

what i can do?

p.s. excuse me for my bad english