Excuse me if I'm talking below you level of expertise...
With an external monitor on a laptop you usually have to activate the plug where you've connected the external monitor cable . This requires pressing 2 keys in combination, usually a FUNCTION button + a specific function key. Yeah, they're named almost the same thing, but I'll try to keep it straight.
On your keyboard's function keys (above the numeric keys typically) should be small pictures besides the standard F1, F2, etc. which are usually in white. You're looking for the picture that resembles a monitor. On my Thinkpad the small pictures are colored blue, and the monitor is on the F7 key. It so happens that my FUNCTION button (different than the function keys we were just talking about) which is located in the lower left of my keyboard is also blue. Yours might be in a different position, but I'm giving you an idea when to look.
When you find the Function Button, press and hold this key and the correct Function key (F1, F2, whatever). You might need to press this 1 or 2 times to get the correct monitor setting. I'm not exactly sure of the order but you'll activate the external monitor, then another combination press will activate both displays, then a 3rd will do another setting, then back to the beginning. If you miss it the first time just slowly press the combination until you get what you're looking for. Be patient, and press once every 5 seconds or so, giving the computer enough time to change its settings.
Hope this helps!
Basic LCD monitor and TV troubleshooting guide:
http://www.fixya.com/support/r6150077-basic_lcd_monitors_troubleshooting
http://www.fixya.com/support/r5093881-lcd_flat_panel_tv_troubleshooting_guide
http://www.fixya.com/support/r7406380-tv_training_manuals
Failed TV and Monitors pictures: http://s807.photobucket.com/albums/yy352/budm/
Learn about bad caps: http://en.wikipedia.org/wiki/Capacitor_plague
Capacitors kit: http://lcdalternatives.auctivacommerce.com/ he can make you a set of caps for you.
Or www.digikey.com just make sure to use caps with low ESR, 105c, high ripple current, long life rating such as PANASONIC FM or FC series.
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