My monitor is unresponsive. Does not power on anymore. Does anyone have any troubleshooting ideas?

The easiest thing to do is find another monitor to plug in to determine if it is the monitor or the computer. Just because something has been stored does not mean that something fried the first time you plugged it back in. LCD monitors are notorious for having bad capacitors.

If the T-CON board is dead,you will see black screen (no picture) but you will see slight glow due the backlights is still on. Check the fuse and voltage on the T-CON board, dead main board will not be sending the voltage to the T-CON board.

But you are saying taht you cannot get any button on the TV to work, that will point the problem to be in the main board.

You will need service manual to really go in-depth troubleshooting.
You can download here for free: http://elektrotanya.com/?q=showresult&megnev=sony&megnev2=KLV-27HR3&kategoria=&kat2=all

Basic LCD monitor and TV troubleshooting guide:
http://www.fixya.com/support/r5093881-lcd_flat_panel_tv_troubleshooting_guide
http://www.fixya.com/support/r6150077-basic_lcd_monitors_troubleshooting
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
Parts: www.shopjimmy.com
Parts: http://interliquidparts.com/

Capacitors kit: http://lcdalternatives.auctivacommerce.com/Default.aspx he can make you a set of caps.
Or www.digikey.com, just make sure to use caps with low ESR, 105c, high ripple current and long life rating such as PANASONIC FM or FC series.
Please post back what you find.

You may have dying power supply problem due to bad DC filter caps, which is is very common problem in ALL LCD monitors. You need to open it up and do some in-depth troubleshooting.
Most common failures in the LCD monitors are bad capacitors (bulging top/seal or leaking) in the power supply (they should be replaced in a set), blown fuses; poor solder joints, failed inverter circuits (blown fuse, shorted transistors, shorted/open transformers), bad lamps (poor solder connections or worn out lamps). You will need to open it up and inspect the inside, see example of failed monitors to get some ideas what to look for: http://s807.photobucket.com/albums/yy352/budm/
Post back what you see inside so we can guide you further and it will help out other people in the future also.

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.

It may have dying power supply due to bad caps as shown in my N3250W here:
http://s807.photobucket.com/albums/yy352/budm/Viewsonic%20N3250W/

If you are going to DIY and have proper tools, electronics knowledge, and know safety precaution then please read on:

Basic LCD monitor and TV troubleshooting guide:
http://www.fixya.com/support/r5093881-lcd_flat_panel_tv_troubleshooting_guide
http://www.fixya.com/support/r6150077-basic_lcd_monitors_troubleshooting
http://www.fixya.com/support/r7406380-tv_training_manuals
Failed TV and Monitors: http://s807.photobucket.com/albums/yy352/budm
Learn about bad caps: http://en.wikipedia.org/wiki/Capacitor_plague
Parts: www.shopjimmy.com
Capacitors kit: http://lcdalternatives.auctivacommerce.com/Default.aspx he can make you a set of caps.
Or www.digikey.com, just make sure to use caps with low ESR, 105c, high ripple current and long life rating such as PANASONIC FM or FC series.
Please post back what you find.
Please leave rating if it helps.

This monitor is released in 2007, more likely to have failed components by now.
Most common failure in the LCD monitors are bad capacitors (bulging top/seal or leaking) in the power supply, failed inverter circuits (blown fuse, shorted transistors, shorted/open transformers), bad lamps (poor solder connections or worn out lamps). You will need to open it up and inspect the inside, see example of failed monitors to get some ideas what goes wrong: http://s807.photobucket.com/home/budm/allalbums
Post back what you see inside so we can guide you further.
http://www.badcaps.net
http://en.wikipedia.org/wiki/Capacitor_plague

Hello,

Your Back light inverter power board has died. The beeping and blinking are caused by the power board repeatedly trying to start up and failing. This is a common failure point of LCD monitors after a few years of use. The heat build up in the monitor case causes parts called capacitors to blow leading to the power supply short. If you can solder you should be able to do the repair. Go to our web site at:
www.ccl-la.com/badcaps.htm We have pictures of what to look for. Now take the back off of your monitor and replace all of the caps that look like the pictures and you should be back going again. Be sure to use high temp parts, they will be marked 105c. The values you will need to get will be marked on the sides of the bad ones such as 220uf, 470uf or 1000uf. When you insert the new ones be sure to put the polarity stripe going the same direction as the old one comes out. If you have any questions just let me know. If you don't want to do the repair yourself we do offer a repair service for $30 + return shipping.

I hope this helps, if so please rate our solution.

Buddy
Corporate Computer
www.ccl-la.com
[email protected]

You're probably lucky that this happened now. You're most likely still covered under warranty. Contact Acer support and arrange a swap. If your pc works okay with another monitor there's no point in troubleshooting further. Get that monitor switched before the warranty runs out.

This a indication of your back lamps are bad

OPEN THE UNIT AND MAKE SURE THE WIRES ARE CONNECTED INSIDE

Sounds like a low power problem, Check the power supply with a good ohm meter set to DC voltage if voltage is less than 14 v. Replace the supply. DWW