I agree with Villagetinker. Your WiFi network is most commonly on two different frequencies. 2.4Ghz which has been around for a long time and was prevalent in older devices. 5Ghz bandwidth is in newer devices with 2.4Ghz capability also. An older device also used an older wireless standard called 802.11g or you will hear G wireless. The newer devices have capability of newer wireless standards, namely 802.11n and 802.11ac. Both are backwards compatible with 802.11g.
Another setting is the encryption protocol which you will see most often as WPA, WPA/WPA2 or just WPA2. Along with that is the encryption key either AES or TKIP. AES is built into the hardware and TKIP is using siftware.
Really old devices only had WPA which is now deprecated (aka not used anymore). TKIP is also only used for compatibility.
The standard is to see WPA2 encryption with an AES encryption key.
If you can see your wireless network, but cannot connect, I would check on the blu-ray player in network settings and if you find WPA, change it to WPA2 if the device is new enough to have that setting. Also, choose AES encryption key over TKIP, but if your device does not have AES setting, you can use TKIP even though it is not as secure.
Most routers from Xfinity, AT&T, etc. have all wireless protocols (ie 802.11b,g,n,ac) enabled by default. They also default to enable both 2.4Ghz and 5Ghz bandwidth frequencies.
However, The encryption protocol for WPA is usually not enabled on a new router since it is very old. Also, AES will be the encryption key on the router by default.
Check that your settings match. Sorry for the long post, but I try to give complete answers to why something might be happening. Rarely, is it a hardware issue.
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