maybe your elgg files aren't owned by any user or group? check who owns your elgg files and then set the proper owner

See http://docs.elgg.org/wiki/White_page

Well, i will check it.But the weird is that in my older server, all the pages were loading.Now on thw new server, the pages still loads for any user, except the adm.

Check the log files, blank page usually refers to a http returning 500, which again usually means PHP Fatal error. See what is actually wrong and report back the error message

Weel, I done somethings:
First, I have changed the .htacess 'display_errors' to 1, and logged in as the admin user.Nothing happened...

After, I removed all the plugins, one by one, to see if this was caused because of a bad plugin.Same here, nothing happened.

I still see blank pages if I am logged in as admin.My site was re-transfered to the dedicated, from a backup of my shared server, but the result is still the same.

Now I have another question: http://community.elgg.org/discussion/view/1594854/name-another-user-as-admin-via-sql-codes

[Admin edit: Linking to the other question instead of asking it in two threads.]

Did you look in your error logs? http://docs.elgg.org/wiki/Server_error_log

[18-Feb-2014 04:04:06 UTC] PHP Fatal error:  Allowed memory size of 536870912 bytes exhausted (tried to allocate 82 bytes) in /home/josecilv/public_html/engine/classes/ElggMetadata.php on line 44
[18-Feb-2014 04:04:14 UTC] PHP WARNING: 2014-02-18 04:04:14 (UTC): "json_encode() [<a href='function.json-encode'>function.json-encode</a>]: Invalid UTF-8 sequence in argument" in file /home/josecilv/public_html/views/default/js/languages.php (line 33)
[18-Feb-2014 04:04:14 UTC] PHP WARNING: 2014-02-18 04:04:14 (UTC): "json_encode() [<a href='function.json-encode'>function.json-encode</a>]: Invalid UTF-8 sequence in argument" in file /home/josecilv/public_html/views/default/js/languages.php (line 33)
[18-Feb-2014 04:04:14 UTC] PHP WARNING: 2014-02-18 04:04:14 (UTC): "json_encode() [<a href='function.json-encode'>function.json-encode</a>]: Invalid UTF-8 sequence in argument" in file /home/josecilv/public_html/views/default/js/languages.php (line 33)
[18-Feb-2014 04:04:41 UTC] PHP Fatal error:  Allowed memory size of 536870912 bytes exhausted (tried to allocate 82 bytes) in /home/josecilv/public_html/engine/classes/ElggMetadata.php on line 44


This is my error log.Any idea?

try to upgrade your elgg to latest 1.8 release

This is almost definitely due to a 3rd party plugin loading tons of metadata. You said:

I removed all the plugins, one by one, to see if this was caused because of a bad plugin.Same here, nothing happened.

How did you do this? Did you put an empty file named "disabled" in the mod dir? If not, try that.

I am not sure, but I think I had the same problem, when I ran out of disc space on my localhost. Had to use gparted. Otherwise delete some old logfiles. I had some really huge ones back then.