power supply problem

My Pc is acting weird. when i turn the switch ON.the power light starts blinking and it keeps doing same for almost 3 minutes then with a glinch, it turns OFF. After that when i press t5he power button again, it starts normally. This is something definitely with my computer's power supply but should i take it to some stores and get my PC checked up by someone? or is this not a big problem?

It may not be a big problem at the moment, but understand a failing PSU can pretty much destroy anything plugged into it. That's extreme, of course, but not unheard of. Certainly, if it fails during a critical write to the hard disk, it can corrupt the drive and you lose all your data. Or it can take out your RAM, or CPU.

Although the symptoms you describe could indicate a failing supply, they do not conclusively point to it. A failing motherboard or another component may be failing and drawing too much current, causing the PSU to become unstable. But still the PSU is the first place to start looking. Assuming you have not recently moved the computer, or been digging around inside and knocked something loose, here's my canned text on testing PSUs.

To properly and conclusively test a power supply unit (PSU), it must be tested under various realistic "loads" then analyzed for excessive ripple and other anomalies. This is done by a qualified technician using an oscilloscope or power analyzer - sophisticated (and expensive) electronic test equipment requiring special training to operate, and a basic knowledge of electronics theory to understand the results. Therefore, conclusively testing a power supply is done in properly equipped electronic repair facilities.

Fortunately, there are other options that are almost as good. I keep a FrozenCPU Ultimate PSU Tester in my tool bag when I am "in the field" and don't have a good spare power supply to swap in. While not a certain test, they are better than nothing. The advantage of this model is that it has an LCD readout of the voltage. With an actual voltage readout, you have a better chance of detecting a "failing" PSU, or one barely within specified ATX Form Factor Standard tolerances. Lesser models use LEDs to indicate the voltage is just within some "range". These are less informative, considerably cheaper, but still useful for detecting PSUs that have already "failed". Newegg has several testers to choose from. All these testers contain a "dummy load" to fool the PSU into thinking it is connected to a motherboard, and therefore allows the PSU to power on, if able, without being attached to a motherboard - great for testing fans, but again, it is not a true load or suitable for conclusive testing.

Swapping in a known good supply is a tried and trued method of troubleshooting, used for years even by pros. If you have access to a suitably sized, spare power supply, carefully remove the suspect supply and replace it with a known good one and see if the problem goes away.

I do not recommend using a multimeter to test power supplies. To do it properly, that is, under a realistic load, the voltages on all the pins must be measured while the PSU is attached to the motherboard and the computer powered on. This requires poking (with some considerable force) two hard and sharp, highly conductive meter probes into the main power connector, deep in the heart of the computer. One tiny slip can destroy the motherboard, and everything plugged into it. It is not worth the risk considering most multimeters, like plug-in testers, do not measure, or reveal any unwanted and potentially disruptive AC components to the DC voltages.

Note the required voltage tolerance ranges:

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And remember, anything that plugs into the wall can kill. Do not open the power supply's case unless you are a qualified electronics technician. There are NO user serviceable parts inside a power supply.

Oh God! You warned me pretty well so i will not get my hands into it. But i will take it to some electrician for sure. Thanks for all the detailed help you did. It will guide someone for sure. I am grateful

It was not my intent to make you think it was beyond your capabilities. Certainly, swapping out power supplies is one of the easier hardware tasks. That said, there is no shame in taking it to a reputable shop and having a professional look at it. What is nice about taking it to a shop is they are responsible for any collateral damage - plus, they will surely have a spare power supply to plug in and quickly determine if that is your problem. Good luck.