SCEE has sent us the official statement on firmware 2.41.
“The PLAYSTATION®3 (PS3™) system software version 2.41 is now available for update from July 8, 2008. With this update, we have fixed the problem that prevented a limited number of PS3s from activating properly after updating to version 2.40, when certain system administrative data were contained on the HDD.
For those users who have updated to version 2.40 and have experienced the problem that XMB™(XrossMediaBar) is not appearing, or no images are displaying on the screen, please contact Customer Service.
We have confirmed that for those users who have successfully updated to the version 2.40 and are able to activate the PS3 system, this problem will not occur on your PS3.
We apologise for any inconvenience this may have caused you and appreciate your understanding and continued support.”