No sleep

My 13" MacBook is not going to sleep anymore :( When I close it, then indicator light never goes to this slow blinking mode and it runs until battery gets empty. When I open LCD, screen is blank and nothing happens. Only way is to press power button for long and time do hard reset.

Called to service and they suggested
1. close all programs when going to sleep - maybe some program crashes on sleep?
Result - no change

2. reinstall OSX - did acrhive install
Result, with 10.4.6 it went sleep 50% of times but when udpated to 10.4.10 everthing is the same

3. get computer here, we will spend some weeks on it - no go I have to work with it.

stay tuned for solution