Topic: I can´t upgrade SME7.0 prerelease to SME 7.1

[phalon]

I'm new in SME, and I´m using it as my proxy and Mail serverin the SME 7.0 Prerelease. I downloaded the SME 7.1 and verify the iso file and it´s ok. But when I try to upgrade my server it only shows a black screen and i can´t use the keyboard. Plz help me. Thank u very much