First of all, take a moment and don't panic! We have all the info you need in the event this rare and untimely event occurs.
First, there are three policies in place for tournament players - one if a crash happens before late registration ends, another after late reg is finished but you're not yet “in the money,” and one while you are in the money. These policies take effect if a tournament cannot be resumed after two hours and is cancelled. If the technical difficulties can be fixed within the two-hour timeframe, then the MTT will continue as though nothing had happened.
If late registration is still open when the tournament is cancelled, then all participants (including those who have busted out) will receive back their buyins, rebuys, add-ons, and re-entries. This is basically a complete refund, and it's as though the tournament never happened.
Players still in a tournament, but not in the money, receive their buy-in and fee back, plus a share of the remaining prize pool proportional to the size of their chip stack relative to the total number of chips outstanding. There is a caveat that no individual prize allocated in this manner can exceed the stated first-place payout.
Players in the money receive an amount equal to the next minimum cash prize. The remainder of the prize pool will be split up according to the percentages of chips held by each player. Again, nobody can receive a prize greater than first place.
These rules cover most freezeout and R&A tournaments. However, additional rules apply to bounty events, multi-flight tournaments, and sit-n-goes. Consult the Winning Poker Network tournament Cancellation Policies for the latest complete tournament cancellation policy.