Computer can ping Fortigate 90D, but not beyond?

So, I'm an IT guy at our company and we have a computer running Windows 10 Pro that we use for Remote Desktop Purposes. A few days ago I installed a wireless adapter on it so that we can bypass some of the restrictions on our LAN. I took the wireless adapter out today, and suddenly I cannot connect to the outside world via LAN.

What I've Verified:

The Ethernet card is up and operational.

I can ping loop-back.

I can ping the Fortigate 90D.

Via CLI on the Fortigate interface, I can ping websites.

I can ping other computers on the network.

Windows Firewall is Off.

Windows Sharing is On.

On the PC I have tried assigning an IP manually with still no luck (our network is 192.168.24.x by the way).

We have a local DNS so I assigned it our DNS with no luck.

I have tried DHCP, and yes, it is assigned an IP but still it will not go beyond our Fortigate.

I have restarted this computer several times. I have reinstalled the network adapter (I don't think that it's that at this point but I did it just to rule it out anyways). I have released and renewed, flushed the DNS, reset adapters... all of that junk. I even tried moving it to another ethernet port. Nothing.

I feel very silly asking about this since it seems so trivial, but I am having an oddly hard time figuring it out. My best guess is that our firewall is preventing it from going through. Any suggestions? Thanks! :)