I bought my HP6735s and lasted for barely one year. I am in Africa so the question of warranty is difficult. Initially, it started with faint vertical lines filling half of the screeen from the middle down. When this happened, the battery charging system will cutoff and a red bar would flash across the battery icon in windows, leaving the battery uncharged at zero percent no matter how long it remained plugged into utility. After tapping the system for several minutes, the screen would come back to normal and the battery malfunction would also stop, however the symptoms have remained since three months now no matter what I tried. I have re-installed the OS with both XP and Vista without improvement. The system is now one year 2 months old with hundreds of vertical lines filling half of the screen with the battery showing dead.