<div>> it may be that grub was not installed. </div><div><br></div><div>I agree; also double check that the drive you installed CentOS on is the drive that you're booting from?</div><div><br></div><div>> <span class="Apple-style-span" style="font-family: arial, sans-serif; font-size: 13px; border-collapse: collapse; ">I've (so far) installed with the default disk layout and </span><span class="Apple-style-span" style="font-family: arial, sans-serif; font-size: 13px; border-collapse: collapse; ">package selection.</span></div>
<div><span class="Apple-style-span" style="font-family: arial, sans-serif; font-size: 13px; border-collapse: collapse; "><br></span></div><div><span class="Apple-style-span" style="font-family: arial, sans-serif; font-size: 13px; border-collapse: collapse; ">You may want to try specifying a /boot partition.</span></div>
<div><span class="Apple-style-span" style="font-family: arial, sans-serif; font-size: 13px; border-collapse: collapse; "><br></span></div><div><span class="Apple-style-span" style="font-family: arial, sans-serif; font-size: 13px; border-collapse: collapse; ">If all else fails, I've found this guide very useful</span></div>
<div><span class="Apple-style-span" style="font-family: arial, sans-serif; font-size: 13px; border-collapse: collapse; "></span><a href="http://www.gnu.org/software/grub/manual/legacy/grub.html">http://www.gnu.org/software/grub/manual/legacy/grub.html</a></div>
<div><br></div><div>You'll probably want this section: <a href="http://www.gnu.org/software/grub/manual/legacy/grub.html#Installing-GRUB-natively">http://www.gnu.org/software/grub/manual/legacy/grub.html#Installing-GRUB-natively</a></div>
<div><br></div><div>Hope this helps,</div><div>Rob</div>