I have a Sony Vaio, which came with Windows Vista Business installed. When\nbooting up, the Microsoft Corporation bar, with the green flashes running\nalong it, is sometimes missing either its lefthand or righthand border. The\nlogin screen might then come in three quarters complete and a quarter blank\nfor a second or two, then complete itself. This an intenittent issue, and\ndoes not affect the normal functioning of the computer, which is otherwise\nflawless. My concern is that it may indicate a problem which will only get\nworse, and which will eventually become a real problem once the warranty\nexpires!\n\nI wondered if it might be related to the fact that I installed XP, using a\nprocedure for my machine detailed on the Sony website, and which involved\ndowngrading the BIOS. After a short while, I then decided to reinstall Vista\nfrom the Recovery partition, and upgraded the BIOS again. I thought maybe\nsomething had not reinstalled properly, but I'm not technically competent\nenough to know if this is likely. Sony support suggests I reinstall Vista\nagain from the Recovery partition, but I don't want to do that unless I have\nto, and unless I'm convinced that it's likely to help.\n\nI'd be grateful for any advice from users on this forum.\n\nMany thanks.