Computer Power Supply Replacement
You sit down to turn on your desktop and it won’t even make a sound — no fans, no lights, nothing. Or worse: it runs for five minutes, then shuts itself off in the middle of your work, then again, and again. In most cases like this the culprit is the power supply (PSU), the part everyone forgets about until it dies — and the one that decides whether the whole computer will power on at all.
Most common symptoms / when you need this
- The computer shuts off randomly on its own, especially under load (games, rendering, several programs at once)
- You press the power button and nothing happens — not a single fan spins up
- The computer starts to power on, then shuts right off, in a loop (a brief “twitching” startup)
- The power supply fan whines, rattles, or has started giving off a burnt smell
- After a power outage or a lightning strike the machine no longer responds
- You added a stronger graphics card or more drives, and the power supply can no longer keep up
- It restarts when you launch more demanding programs, even though everything else is fine
What exactly we do
First we check whether the power supply is really the culprit, because the same symptoms can come from the motherboard or an overheating processor. We test the PSU under load, measure the voltages on the rails (3.3V, 5V, 12V), and watch whether they hold steady or drop when the computer asks for more. Only once we’re sure it’s the power supply do we go further.
When we replace it, we don’t just grab “whatever fits.” We choose a power supply that truly matches your configuration — enough wattage (W) for the graphics card and the rest of the components, the right connectors (24-pin, CPU 8-pin, PCIe for the graphics card), the correct case form factor, and an honest efficiency rating — not the cheapest no-name box that will drag the motherboard down with it within a year. We route and tidy the cables neatly, and after the install we run the machine under load to make sure it holds steady and doesn’t shut off.
How it works
Two options, whichever is easier for you. You can bring the case in to one of our three locations in Belgrade — Arena, Piramida, and Centar by the Botanical Garden. If carrying it doesn’t suit you, a courier picks up the unit and brings it back when it’s done — desktop cases can be heavy, so the courier carries it, not you.
Diagnostics are free if no disassembly is needed. Since replacing the power supply means opening the case and reconnecting cables, we tell you about that part and the exact price up front — we do nothing without your approval. You can always see prices for power supplies and labor in our price list, and after the inspection you get a concrete figure before we touch anything.
Why choose us
We replace power supplies all the time, from old office machines to more powerful gaming and workstation builds. We don’t sell overpriced wattage you don’t need, but we also won’t put in an underpowered unit that will struggle — we pick what your computer actually calls for. You get a warranty on the installed power supply and the labor, so if something acts up afterward, we sort it out. You can track the repair status online through our status check, no calls and no waiting.
If you’re not sure it’s actually the power supply, feel free to check out our desktop repair as well — along with a power supply replacement we often clean out the dust and check the temperatures, since overheating and a bad power supply tend to go hand in hand. For portable devices, there’s our laptop repair.
Frequently asked questions
How do I know the problem is the power supply and not something else?
You don’t have to know — that’s what the inspection is for. A typical sign is the computer shutting off on its own under load, or not responding to the power button at all. We confirm it by measuring the voltages, since similar symptoms also come from the motherboard. We’ll tell you honestly what the culprit is, and won’t sell you a power supply replacement if that’s not where the problem lies.
Can a bad power supply damage the rest of the computer?
It can, and that’s the main reason not to put it off. A power supply that puts out unstable voltages will, over time, force the drives, memory, and motherboard to run on the edge, and in the worst case takes them down with it when it finally dies. That’s why it’s worth replacing as soon as it starts causing problems.
Do I need a more powerful power supply than I had?
It depends on what’s in your case. If you’ve added a stronger graphics card or more drives in the meantime, the old power supply probably can’t keep up anymore and we go with a more powerful one. If the configuration stays the same, we pick an equivalent with a little headroom — just enough to run comfortably, without wasting money on wattage you’ll never use.
Is your computer shutting off by itself or refusing to power on? Call 069 1303 111 or check prices in our price list.