I want to add a new PC to the domain. I have added it to the domain, and it got its IP address from the DHCP server, but I can't connect it to the Internet from this PC. Could you please tell me the answer?

Do you have the Hardware Firewall ? If you got it , you should check on your firewall for surfing internet by that IP ?

Because sometime all the IPs are block and allow by firewall.

How about other PCs ? Can go to internet ? If can , use that IP, DNS and Default Gateway of that PCs on the new PC ?

I hope It will work

Thanks

Well, I'd start with basics, can you ping the default gateway from the IP address you have been assigned? If you can, are you able to ping ip addresses outside of your network? If not, I'd make sure there isn't a firewall restriction, or that your default gateway has been assigned correctly.