I need a power cord for a Polyview V293 computer monitor.

The speaker input jack on the Polyview V293 is right next to the power jack on the bottom of the monitor

If the power adapter is a separate from the monitor then check the monitor's label on the back of the screen for the power rating.If the rating on the label is greater than 3.16A then I would not purchase this adapter.
I suggest you purchase an adapter with a current rating greater than what is stated on the monitor's label.
Check out this WEB site for power adapters - a 19Volt 90 watt = 4.7A power supply is suitable.
http://www.cheaperoz.com/z/result.jsp?ga=sc1&q=19v+power+adapter

Well, common failure in the LCD monitor after a couple years are due to failed DC filter caps in the power supply as you can see in my albums.
If you are going to DIY and have proper tools and know safety precaution then please read on:
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/home/budm/allalbums
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 troubleshooting guide:
http://www.fixya.com/support/r6150077-basic_lcd_monitors_troubleshooting

http://en.wikipedia.org/wiki/Capacitor_plague
Capacitors kit: http://lcdalternatives.auctivacommerce.com/ he can make you a set of caps for you.

try this link below to download the driver
http://www.driverstart.com/start592730.html

Check your power saver settings

Start - Control Panel - Power

http://www.google.com/products?hl=en&rlz=1T4GZAZ_enUS359US359&resnum=1&q=Amptron+POLYVIEW+V293+POWER+SUPPLY&um=1&ie=UTF-8&ei=Sax9S6_0CYXYsQO9jLXlCQ&sa=X&oi=product_result_group&ct=title&resnum=3&ved=0CB8QrQQwAg

Replace the power-cord.

Wait until midnight, and turn out all the lights in the room, so that's dark in your computer room.

Turn on the monitor, and see if you get any light and/or any lamps (green? yellow? red?)

Try a different monitor attached to your computer.

Try your monitor on a different computer.

I found this power cord thru Ebay:

http://cgi.ebay.com/AC-Power-Supply-Cord-PolyView-PT-725A-17%22-LCD-Monitor_W0QQitemZ350234908070QQcmdZViewItemQQimsxZ20090802?IMSfp=TL090802135003r13298

Runs about $30.00. You might be able to find a cheaper one thru searching but at least you know that they are out there.

The first Polyview has a power supply problem (a short) and locks out the power until it is unplugged. You need to check the voltages inside the Monitor to determine which component/s are faulty. I hope you know electronics if not leave it to the repair shop because you have neither the skills or equipment to repair it. By the way I am not a monitor repair man but I do have 30 plus years in the electronics field.
The second monitor may have a broken wire in the cord that goes to your computer. Other internal components can cause the same simptoms your seeing. Good luck!

if your monitor has speakers, and it should  built in; then you will see a separate lead with  green plug on the end of it which is to be located in the rear of your pc with the green marked socket.

 

If theres no lead, then there must be a connector on the rear of the monitor