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Computer Suddenly Died


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#1
Zeemis

Zeemis

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Last night, I was on my PC and it worked fine. I turned it off (like I do every night) and when I turned it back on, it didn't work.
(I've heard you're not suppose to turn your computer off unless you really have to, ie: going on trips, but I didn't know if that was true)

For the last few months, my computer has been locking up on me, it shows a solid green light and a red flashing light next to the power-on button and reset button, the red buttons icon is a "can" or something.
When ever it would lock up, it'd go bright red until it stopped locking up.
This only really started when I installed Vista... >_<


So I turned on my PC this morning like I do everyone morning and my screen wouldn't turn on, well to be more exact...
My monitor with not cables going to my CPU, it says I need to connect them. It shows a brownish-orange light when something isn't right and a green light when it works perfectly and I get a picture on the monitor. I at first thought maybe something was wrong with the monitor or a cable came loose but I shortly after found out that my keyboard lights didn't blink when the computer was reset. (My keyboard is also a keyboard that has lights under the keys, they don't show now when I turn the PC on.)

The PC does turn on like normal, but my mouse and keyboard have no power to them, same with my monitor so I think it's the monitor.
When I turn on my PC, the red light goes solid red for a few seconds, then it goes black again, same goes for when I hold the power-on button for five seconds. When I open my disc drive and close it, it seems like it resets the PC altogether.

I believe the motherboard is fried but I don't know, any idea guy?
Please help.
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#2
Digerati

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The mouse and keyboard are totally separate from the monitor, so the monitor would not affect the keyboard lights. The first thing to do is swap monitors with another computer, and see if the problem stays with the computer, or follows the monitor.

With multiple problems, I look to power. To properly test a power supply unit (PSU), a qualified technician puts the PSU under various realistic "loads" and analyzes the voltages for ripple and other anomalies using an oscilloscope or power analyzer.

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 can better detect a "failing" PSU, or one barely within specified 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, not a true load.

A good alternative test method is to swap in a known good supply (with ample power).

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 then 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 the multimeter, like plug-in testers, do not measure, or reveal any unwanted AC component to the DC voltages.
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