I own an acer travelmate 290, and getting no display on monitor.

First check to see if your PC has a built in factory restore, or system recovery, usually available using CTRL & F12, F10, etc. Check your manual, if you don't then, OK try this, Startup PC, press F8 at instant of turn on... choose Safe Mode. when you are asked if you want safe desktop or system restore choose restore, when you get to the restore menu, choose a date BEFORE you had problems there may only be one or two to choose from. just follow the instructions and you should be back to working with all that behind you. If that doesn't work, boot up on your Windows DVD and do a "Repair Install", If thats doesn't work do a format and a reinstall.