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I had the same issue with 10.04. I found the article here:<BR>
<A HREF="http://ubuntu-tutorials.com/2010/05/06/ubuntu-10-04-lucid-blank-screen-at-startup-workaround/">http://ubuntu-tutorials.com/2010/05/06/ubuntu-10-04-lucid-blank-screen-at-startup-workaround/</A><BR>
worked for me.<BR>
<BR>
-----Original Message-----<BR>
<B>From</B>: Lee Sharp &lt;<A HREF="mailto:Lee%20Sharp%20%3cleesharp@hal-pc.org%3e">leesharp@hal-pc.org</A>&gt;<BR>
<B>Reply-to</B>: Ubuntu South African Local Community &lt;ubuntu-za@lists.ubuntu.com&gt;<BR>
<B>To</B>: <A HREF="mailto:ubuntu-za@lists.ubuntu.com">ubuntu-za@lists.ubuntu.com</A><BR>
<B>Subject</B>: Re: [ubuntu-za] Ubuntu on P4<BR>
<B>Date</B>: Thu, 12 Aug 2010 08:54:51 -0400<BR>
<BR>
<PRE>
On 08/12/2010 08:52 AM, Charl Wentzel wrote:
&gt;  &gt; -----Original Message-----
&gt; *&gt; From*: Lee Sharp &lt;<A HREF="mailto:leesharp@hal-pc.org">leesharp@hal-pc.org</A> &lt;<A HREF="mailto:leesharp@hal-pc.org">mailto:leesharp@hal-pc.org</A>&gt;&gt;
&gt;
&gt;&gt;  Sounds like a video problem.    What video card are you using?
&gt;
&gt; Not sure how to determine that if I can't get into the system.    How do I figure it out?

Boot in rescue mode with a command line, and do an lspci.  Or look at it 
from your running Windows.

                        Lee

</PRE>
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