May I know why iMac cant find a home wifi while my iPad and hand phone is cnnetced.

Hi, chwee yng.

Thank you for visiting Apple Support Communities.

Sometimes a simple power cycle of the router can correct the issue that you are experiencing. However, the issue could be a little more complex. Wi-Fi routers need adjustments to settings periodically for optimized performance with the constant progression of wireless device technology. Below, I have included two articles. The first article will cover basic Wi-Fi troubleshooting. The second article covers the recommended settings for current Wi-Fi access points.

Wi-Fi: How to troubleshoot Wi-Fi connectivity

http://support.apple.com/kb/HT4628

iOS and OS X: Recommended settings for Wi-Fi routers and access points

http://support.apple.com/kb/ht4199

Cheers,

Jason H.