Site Stopped Working - Can't Checkout

[Jeff_Mash]

Recently, our working ZenCart server was powered down due to an outage at the hosting company. It was brought back online and now our site is accessible. However, when going to the checkout area, it hangs and finally times out with the following error:

The page isn't redirecting properly.

Firefox has detected that the server is redirecting the request for this address in a way that will never complete.

* This problem can sometimes be caused by disabling or refusing to accept
cookies.

Also, when trying to go directly to the PayPal Express checkout, we get tons of these errors: "- (6) Couldn't resolve host 'api-3t.paypal.com'"

From researching past tickets, I see that this could be caused by DNS issues with the host. My question is, can I do anything to remedy this in cPanel?

NOTE: I should mention that I have installed the Fast and Easy Checkout module which loads the checkout.html on one page. However, this was working prior to the server going down so it isn't a configuration issue. I am leaning towards a DNS problem but I don't know how to check that out. The site is functional in every other way except checking out through zencart or through PayPal Express. We have been down for almost two days now and need some help!