My AMD Gaming PC Keeps Malfunctioning and Won’t Work Properly

I purchased a prebuilt gaming PC with an AMD processor and graphics card from Gamegaraj in June. The product arrived quickly, and I initially didn’t touch it for a day. The next morning, I installed the graphics card, but the PC wouldn’t power on—not even the fans. I sent it to the service center, where it stayed for 20 days. When it returned, the packaging was good, and the PC worked initially. However, on September 1, the monitor stopped receiving a signal and entered power-saving mode. I tried restarting it 30 times and only got it to work once by chance. This isn’t acceptable. I’m frustrated and anxious because I can’t use the computer properly. Am I supposed to keep sending it for service repeatedly? I’ve been using computers for 12 years, and this is the most problematic experience I’ve ever had. I expect Gamegaraj to provide a permanent solution so I can finally use my PC without constant issues.