I turned off my PC to go to bed but realized I needed to upload something, so I turned it back on. After plugging in my phone, my computer suddenly shut off. This isn't the first time it's happened—it's done it about four times before, but I usually just reboot it. However, this time I saw a white flash from my tower, and now my PC won't start at all. I built this setup for $5000 in June 2025, and everything is brand new. It's my first time building a PC, and I've been dealing with issues like freezing for months. I'm not sure if it's the motherboard, GPU, RAM, or PSU that's causing the problem. My PSU is 1200 watts, which should be fine for my setup that includes a 5090 and a 9950x3D, along with 32GB of RAM and two SSDs (one 2TB and one 4TB). Any ideas on what might have gone wrong?
4 Answers
Quick question, where do you plug in your PC? Is it going into a wall outlet or a power strip? Sometimes the setup can impact power stability.
Definitely start by checking your PSU first. You can test it really easily using a paperclip to see if it powers on. Just make sure you handle everything safely! Here’s a guide that could help. By the way, does your PSU brand mean it'll be compatible for testing?
That white flash isn't a great sign. It sounds like your PSU might have failed, even though 1200W should be sufficient for your setup. Sometimes, if the PSU is a lower quality or defective, it can fail in a catastrophic way. Given that it happened right after you plugged in your phone, I wonder if there was a power surge or short. Did you connect your phone to a front panel USB or direct to the motherboard? Either way, I’d recommend starting with the PSU for an RMA; it’s likely what caused the issue.
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