admin -> modules -> blank screen

admin -> modules -> blank screen
Drupal installation 4.7.4

After uploading the "user status" module 4.7.x-1.1 (2007-Jan-15) and attempting to display the installed modules I got a blank screen. I removed the "user status" module directory and the blank screen persists. I am unable to access any modules via admin.

I did not have a previous version of "user status" installed, so it is not an upgrade problem.

drupal/admin/modules no longer works. I need a way to get back access to the modules screen.

I assume the problem was initiated by "user status" module but I have no way to prove it. The last time I used admin/modules, it worked perfectly 1/12/2007.

When I view the page source for the blank screen, there is no markup, just another blank screen.

I can't activate Trace without admin/module, Catch-22.

All other admin functions are working. I have no other bizarre behavior from this Drupal installation (4.7.4).

I need to know how to debug this problem.

Thanks for your help
John Walling
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Here is a list of modules I have installed:
C = CORE not enabled
CD = CORE DEFAULT
CE = CORE ENABLED
CR = CORE REQUIRED
O = OPTIONAL not enabled
OE = OPTIONAL ENABLED

01/12/2006 - 38 enabled
C aggregator Aggregates syndicated content (RSS, RDF, and Atom feeds). need fsockopen function
C drupal Lets you register your site with a central server and improve ranking of Drupal projects by posting information on your installed modules and themes; also enables users to log in using a Drupal ID.
C legacy Provides legacy handlers for upgrades from older Drupal installations.
C locale Enables the translation of the user interface to languages other than English.
C path Allows users to rename URLs.
C ping Alerts other sites when your site has been updated.
C throttle Handles the auto-throttling mechanism, to control site congestion.
C tracker Enables tracking of recent posts for users.
CD comment Allows users to comment on and discuss published content.
CD help Manages the display of online help.
CD menu Allows administrators to customize the site navigation menu.
CD page Enables the creation of pages that can be added to the navigation system.
CD story Allows users to submit stories, articles or similar content.
CD taxonomy Enables the categorization of content.
CE archive Displays a calendar for navigating older content.
CE blog Enables keeping an easily and regularly updated web page or a blog. 1/6/2007
CE blogapi Allows users to post content using applications that support XML-RPC blog APIs. 1/6/2007
CE book Allows users to collaboratively author a book.
CE contact Enables the use of both personal and site-wide contact forms.
CE forum Enables threaded discussions about general topics.
CE poll Allows your site to capture votes on different topics in the form of multiple choice questions.
CE profile Supports configurable user profiles. 1/2/2007
CE search Enables site-wide keyword searching.
CE statistics Logs access statistics for your site.
CE taxonomy_browser 1/5/2007
CE upload Allows users to upload and attach files to content.
CR block Controls the boxes that are displayed around the main content. required
CR filter Handles the filtering of content in preparation for display. required
CR node Allows content to be submitted to the site and displayed on pages. required
CR system Handles general site configuration for administrators. required
CR user Manages the user registration and login system. required
CR watchdog Logs and records system events. required
O trace Adds tracing facilities for Drupal hook invocations, database queries and PHP errors.
OE civicrm Constituent Relationship Management (CRM - v1.5). Allows sites to manage contacts, relationships and groups, and track contact activities.
OE content CCK: Allows administrators to define new content types.
OE E-Mail field email field type for CCK 1/12/2007
OE imce Provides an image browser for tinyMCE.
OE Invisimail provides a content filter to hide email addresses from spam-bots 1/11/2007
OE link CCK: lets you add a complete link to your content types; including URL, title, and optionally a target attribute 1/11/2007
OE nodereference CCK: Defines a field type for referencing one node from another. Note: Requires content.module.
OE number CCK: Defines numeric field types. Note: Requires content.module.
OE optionwidgets CCK: Defines selection, check box and radio button widgets for text and numeric fields. Note: Requires content.module, text.module and number.module.
OE site_user_list Provides a searchable, sortable list of all the users on the site 1/10/2007
OE text CCK: Defines simple text field types. Note: Requires content.module.
OE tinymce The TinyMCE Javascript HTML WYSIWYG editor.
OE urlfilter Automatically turns web and e-mail addresses into clickable links. 1/10/2007
OE userreference CCK: Defines a field type for referencing a user from a node. Note: Requires content.module.
OE views The views module creates customized views of node lists 1/12/2007
OE views_ui The views module creates customized views of node lists. 1/12/2007