360 wireless adapter

can anyone help me, i have been using my wireless adapter for a couple of years now on my 360 with no problems. i have my old 360 flashed and bought a new 360 elite to use with xbox live, now my wireless network cannot see the wireless adapter, i have used a ethernet cable just to make sure it works and there is no connection problems , i donot want to use the cable as the elite is in another room. the only thing i have noticed is that the led on the back of the 360 wireless adapter glows red and i can’t remember if this is the correct colour. thank you for looking at my problem and i hope that you can helpme.
p.s the wireless router is working fine as there are no wireless connection problems to my ps3 and wii which are next to the elite.
thank you,