I'd previously followed the advice here - http://androidforums.com/desire-hd-...ck-boot-blackscreen-cannot-mount-sd-card.html and successfully installed Jellytime. Last week, for no apparent reason, it would no longer boot. I can get into 4EXT, and clear cache, etc, but when rebooting it shows the HTC logo and then renders a black screen. I can see others have had similar issues, though they seem to refer to issues with the bootloader too which I don't have. Help please!