PROBLEM SOLVED

after 4 days of having this blank screen problem i found the problem to be with a virtual cart bot
namely - mosproductsnap
i uninstalled that bot and everything works fine

thanks every1

ok iv narrowed the problem down to something
after getting a fresh install to work in a seperate directory i tried copying and replacing all directories in the fresh install with the files and directories of my previous site (the real site thats having the problem)
i did this and found that once i copy the mambots directory i get this error, so im guessing its got something to do with one of the components im running? maybe its conflicting

i just installed a fresh copy of joomla and smf in a directory on my server called  "temp" and the bridge works fine, i guess this means im not having php problems!! so what could be the problem? any way i can fix this?!?!?!

im on a virtual private servers n i cant find any php error logs
the support at 1and1 are so rubbish, after 20 minutes on the phone the guy couldnt tell me where to find the logs!!
so i used the error reporting script and put it in index.php but its not reporting any errors, the error_log.log file is empty :S

i dont get a totally blank page, after patching install i get a white page with the word HOME in the top left corner
is this still the same problem? as i cant find any error logs!!! nothing is being written

this is what i can see in my error log (maximum setting on joomla didnt report any errors)
i cant make sense of any of this :S

[Thu Jan 04 03:12:35 2007] [error] [client 87.106.50.11] client sent HTTP/1.1 request without hostname (see RFC2616 section 14.23): /w00tw00t.at.ISC.SANS.DFind:)
[Thu Jan 04 03:35:51 2007] [error] [client 80.3.0.10] File does not exist: /var/www/vhosts/persianhiphop.com/httpdocs/persianhiphop.com
[Thu Jan 04 03:35:54 2007] [error] [client 80.3.0.10] File does not exist: /var/www/vhosts/persianhiphop.com/httpdocs/persianhiphop
[Thu Jan 04 03:35:58 2007] [error] [client 80.3.0.10] File does not exist: /var/www/vhosts/persianhiphop.com/httpdocs/persianh
[Thu Jan 04 04:10:19 2007] [error] [client 87.106.101.232] File does not exist: /var/www/vhosts/persianhiphop.com/httpdocs/persianhiphop.com
[Thu Jan 04 12:39:54 2007] [error] [client 74.6.74.226] File does not exist: /var/www/vhosts/persianhiphop.com/httpdocs/robots.txt
[client 74.6.71.158] script '/var/www/vhosts/persianhiphop.com/httpdocs/index.php' not found or unable to stat
[client 74.6.72.78] script '/var/www/vhosts/persianhiphop.com/httpdocs/index.php' not found or unable to stat
[Thu Jan 04 12:41:12 2007] [error] [client 217.219.26.71] File does not exist: /var/www/vhosts/persianhiphop.com/httpdocs/forum, referer: http://www.google.com/search?hl=en&q=khoshgeltarin
[client 217.219.26.71] script '/var/www/vhosts/persianhiphop.com/httpdocs/index.php' not found or unable to stat, referer: http://www.google.com/search?hl=en&q=khoshgeltarin
[Thu Jan 04 12:42:00 2007] [error] [client 85.185.150.118] File does not exist: /var/www/vhosts/persianhiphop.com/httpdocs/modules, referer: http://music-iran.blogsky.com/?Date=1384-08
[Thu Jan 04 12:43:57 2007] [error] [client 85.198.17.209] File does not exist: /var/www/vhosts/persianhiphop.com/httpdocs/downloads
[Thu Jan 04 12:43:58 2007] [error] [client 85.198.17.209] File does not exist: /var/www/vhosts/persianhiphop.com/httpdocs/downloads
[client 74.6.68.34] script '/var/www/vhosts/persianhiphop.com/httpdocs/index.php' not found or unable to stat
[client 207.59.120.81] script '/var/www/vhosts/persianhiphop.com/httpdocs/index.php' not found or unable to stat, referer: http://en.wikipedia.org/wiki/Nazanin_Mahabad_Fatehi
[client 85.185.107.252] script '/var/www/vhosts/persianhiphop.com/httpdocs/index.php' not found or unable to stat, referer: http://search.yahoo.com/bin/search?p=persian%20rap%20download
[client 71.65.97.99] script '/var/www/vhosts/persianhiphop.com/httpdocs/index.php' not found or unable to stat, referer: http://www.google.com/search?client=safari&rls=en-us&q=Bale%2Bfarez&ie=UTF-8&oe=UTF-8
[client 195.229.241.182] PHP Warning: Invalid argument supplied for foreach() in /var/www/vhosts/persianhiphop.com/httpdocs/test/php/test.php on line 12, referer: http://www.persianhiphop.com
[client 74.6.70.34] script '/var/www/vhosts/persianhiphop.com/httpdocs/index.php' not found or unable to stat
[Thu Jan 04 12:49:54 2007] [error] [client 74.6.74.223] File does not exist: /var/www/vhosts/persianhiphop.com/httpdocs/robots.txt

im having the EXACT same problem
the problem occurs once i click the patch button
my site: www.persianhiphop.com
funny thing is if i access my site using this link http://persianhiphop.com/index.php?option=com_smf&Itemid=57 it works fine, and i can access everything on the site EXCEPT content items like  news etc... so if i click on a published article i get a blank page and if i click home i get a blank page too, im guessing thats because i have articles published on the front page? hmm

any ideas any1?

just for ur info here is a lil more information, this might not even have anything to do with this error but i thought u might wanna know, maybe this could be causing it?:

magic_quotes_gpc On 
magic_quotes_runtime Off
magic_quotes_sybase Off
Session Directory /var/lib/php/session/ Unwriteable

no its not anything to do with the usernames, iv uninstalled and did it agian so many times, the problem occurs as soon as i patch the index.php file, iv got joomla and smf both using admin as the username etc..
like i said if i access my site using the link: http://www.persianhiphop.com/index.php?option=com_smf&Itemid=57&
i can see the site including everything EXCEPT articles and and news etc...

any ideas why this is?

just for ur info here is a lil more information, this might not even have anything to do with this error but i thought u might wanna know, maybe this could be causing it?:

magic_quotes_gpc On 
magic_quotes_runtime Off
magic_quotes_sybase Off
Session Directory /var/lib/php/session/ Unwriteable

thank u
the admin end seems to be working fine and i did read the faq but it didnt answer my Q as im not really getting a blank page, i can see the word HOME in the corner, u can see this 4 urself at www.persianhiphop.com
i checked for error logs and there were none and i even put the error reporting to maximum in joomla, still nothing, same page with HOME in the left corner
please help me

funny thing is if i access my site using this link http://persianhiphop.com/index.php?option=com_smf&Itemid=57

it works fine, and i can access everything on the site EXCEPT content items like  news etc... so if i click on a published article i get a blank page and if i click home i get a blank page too, im guessing thats because i have articles published on the front page? hmm