Had recent problem with pen4 had built up scratch it would not boot up operating system just do its usual post checks screen go blank for a few seconds then come with another menu all these result in done booting if selected so after checking and rechecking a few days later i decided to remove the interenal battery after some time i re inserted the battery and started up the boot sequence cause it was restarted it detected there was a memory module at fault to check this i accepted the setting sure enough it came up with the same screen i sw off the machine and removed the suspect module it booted into windows but i had to reactivate windows what a drag well your probably thinking whats he babling about i did post a message on the site for help but seems to have dissapered well thanks everybody for help will keep in touch from time to time