I had the same problem when i wrote CCNA. The computer which i used crashed, and it took local staff over 20 min to fix it. I ran out of time.
2nd time the same happened, and i refused to continue. During the week i complained to the boss of the testing center, and got the refund for the 2nd test and i got a voucher for next attempt.
Even on 3rd attempt one of the sims crashed, but it took only 5 min to fix it.
You are allowed to and should make a complaint BEFORE you leave the test centre. I also had an issue in Canada and they told me i could not make a complaint at the test centre, this is not true, i complained to Cisco and the next time i took a test this test centre was not on the list anymore. I eventually got a voucher from Cisco.
Made me smile. Just to share...
One Friday morning, I once was working on MCSE, in South Africa (cheap study). I sat down to sit the XP exam 70-270 (you have to sit an OS exam with MCSE). Within 5 mins or so, the power in Cape Town went out. Everywhere. And no UPS on the test center computers.
I waited for about 45mins, before they cancelled the test. They offered to reschedule the test at no cost, and were very apologetic, but alas I got a new networking job confirmation on the Friday night, which was in California, starting Wed, and I needed to go back to the UK first, to collect & drop off some things (was in SA for over 5 months). So therefore I couldn't accpet the new offer of a test.
I got a test print-out for something like 7%, or 27%, I don't recall now.
When I got to CA, my hotel was right in the heart of the Cisco HQ buildings (Milpitas), trippy, I thought.
Some months later, Microsoft wrote to me, out the blue, and offered me a free retest, saying don't be put off etc, you can succed at MS study. I smiled, booked it in the UK, and aced it. Same place I first passed my CCNA...
And it looks like I could have some fun again. Will sit CCNP route here in Phuket in the not-too-distant future. I hope they are more understanding of this sort of event than I have read about here...