Instruct: Classify the given Amazon review into positive or negative sentiment.
Query: My computer works now

I hate Dell for not knowing why my new Studio XPS 9000 computer would shut off without any reason. I spent days on the phone with Dell tech support and they were going send a tech to tear apart my new computer. I read the reviews on Amazon about Studio XPS 9000 and using the CyberPower Sinewave UPS. Dell had no idea how to fix the problem until I told them it needed a Sinewave UPS. I have been trouble free for a year and have been extreemly happy with the UPS. Works great and no problems ever.