Devices can't sign into home wi-fi?

We just got the internet a few months ago and it's been working perfectly fine on the laptop and on another laptop of a friend but my brothers HP Pad thing (like an iPad but HP) I don't know what it's called, anyway it was working just fine through our internet connection but now it doesn't work.
Also my boyfriends iPod Touch won't sign in at all.

The password has not been changed or anything and it's being typed in perfectly fine, and my brothers HP Pad has it remembered but won't work still.

I'm getting an iPhone soon and don't want to not be able to sign into the internet at home…
Anything we can do? Is it the internet/router or the devices? Like I said the 2 laptops still work.

Sometime a quick reboot of your router can fix all of your problems. Try it!

How are you using the Internet connection? Through a wireless ADSL modem? If so problem might be with the firewall, or internal modem settings.

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