Admin bar not displaying

-try deactivating ALL plugins temporarily to narrow down and possibly fix the problem. If the problem goes away, activate them individually (one-by-one) to find the culprit.

-switching to the default theme (“twentyten”) for a moment by renaming your current theme’s folder in wp-content/themes. The idea is to force WordPress to fall back to the default theme to rule out any theme-specific issue.

Your theme is missing the wp_footer() code in the footer.php file.

Look at the twentyten theme’s footer code and compare it to your theme.