having some prob with new charger for laptop

hello .. i recently bought a new charger for my asus laptop like charger is chinese made i think means cheap duplicate one… it was working ok but today i connected monitor with my laptop n then i saw like there were waves on monitor n when i removed charger it became normal .. means charger is doing something …
so question here is , is this normal ?? or its the duplicate charger which is causing the problem … and m not gonna use monitior now but is the charger ok with laptop ??? or it may cause some prob to the laptop ??
Answer #1
Probably won’t do any harm.
What monitor connection were you using, VGA ?
VGA is more prone to interference than HDMI or DVI.
If running a monitor, try keeping the monitor and charger and their cables well separated..
Answer #2
Under warranty? Send it back and get a good one. Like $10 more for a good one. They meet all the standards, look for all the white approved stamps on it. I hope it’s not a universal one. Universal anything is probably no good except for The Universe. With Google you can find the exact one, do your homework. Laptop voltages vary so a “universal” is not good.. BTW, that screen thing ? Does it happen ONLY when you plug power in? Does it do that when you tilt the screen a couple times? Just wondering, add to message if so. Google is my friend
Answer #3
it was vga connection with monitor .. and yea when i removed the charger, the monitor became ok …. and the charger voltage wattage n amp is same as original one ..
the cables were close to each other .. like the connection points are just 3 inch apart…