<human>: Give me the gist of the text in a nutshell

This Monday was my first night managing a fast food place by myself (had 4 whole days of training the week before). The General Manager left to another state for a training seminar or something earlier that Monday. At 11:30pm the operating system on the computer registers went down and we had to start using cash only and hand writing orders on paper. I wrote down everything that was ordered and how much it was so we would have a sales record of sorts. I called the GM as soon as possible and tried to tell him what was going on. He told me to call the Tech Support line for the registers OS. Luckily one of the guys working that night was an ex computer tech worker, so after a while on the phone they figured out what was wrong. Unfortunately I was trying to count cash from the registers at the same time that he was in the office (where all the money is) looking at the computers.

After the next two days off, one of which the registers went down again, I show up and the GM starts saying that money was short from that night, basically accusing my coworker of stealing it, and that it was my fault the registers OS went down in the first place. He said a bunch of crap about how someone was trying to 'sabatoge' the store and that an angry coworker must have turned off this special computer in the office that connects the registers to the tech company. The worst part is that the registers went offline WHILE HE WAS THERE and he had to call the support line to get everything back up, but he still thinks it's me or a coworker fucking with stuff in the office. I had to call tech support again tonight for another problem and got into a conversation with the guy about how fucked up our systems are. I'm pretty sure the cash will be super fucked up again because of all these computer problems but I can't do anything about it.
<bot>: Computer problems are being blamed on me and my coworker and I can't afford to lose my shitty job. I don't know what to do.