Ethernet light on PA4010 is flashing? Any anti-virus software running on your PC? What is it? Try to disable it and run the utility again.

Thanks for reply
I use WINDOWS DEFENDER switched it off ,still cannot detect DEVICE. can you explain to me how to use UTILITY and connect device to check it with a network cable

Just want to explain how my system works.
I get internet from a TELEPHONE CABLE to WIFI ROUTER which my Computer then picks up, i have extended the internet to another WIFI ROUTER to upstairs of house with TL-PA211KIT which worked fine for 3 months not one problem at all.
I then replaced them with TL-PA4010 AV 500 NANO which keeps on disconnecting.
I have put back the TL-PA211KIT and inter is on for 2 days no problem
Thanks

Connect one TL-PA4010 to PC by ethernet cable and ethernet light on the adapter should be on or flashing.

The ethernet lights does flicker on off ,but still unable to detect device via UTILITY (DOWLOADED FOR WIN 8.1 FROM TP LINK WEBSITE)
Thanks

PA211 can be detected or not? Can you try different PCs? I mean install the utility on a different computer and check if it makes any difference.

hi, did you download the TL-PA4010(EU)_V1_Utility_131216 on the following link?
http://www.tp-link.com/en/support/download/?model=TL-PA4010&version=V1#tbl_b