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does it boot up completely or just a blink of logo or ?
could be power failure due to what?? power module, cpu chip fan
failure, clock/battery dead, ...just searching my mind for ideas.
could also be a motherboard capacitor over heating in which case
will fail completely at some point. remove chasis and check those round capacitors(like tiny oil barrels shape) all over MB. if bad they will be swollen at top where the + is. if cpu fan is not spinning then a failsafe error happens so cpu won't burn up. how old is machine?
also, ac adapter may be failing to provide power.
open your pc panel, look for the heat-sink fan over your cpu(processor). there is a small fan over it and if it is not spinning your PC will not boot. could be a wiring issue where the wires(white/red usually) are broken or not connecting to motherboard good enough. check those but be careful no to break wires or connections. you may need to replace the heat sink module. if any capacitors on motherboard are swollen(little cylinder looking objects with + mark on top) will indicate overheating and motherboard may have failed. if fans spin on heatsink, then pc boot file may be damaged where then a shop will cost to fix it. fans will be the cheap fix else$$$
1) I have to assume that you installed the caps in the correct direction, observing the polarity. Otherwise they would explode. I should state 'probably' because I have never installed a cap backwards. Do not know if they explode every time, or not.
Point is if they do not explode every time if installed backwards, then see if you have installed them correctly. Line the Negative polarity marking on the cap, to the Negative polarity marking on the mobo. (MOtherBOard)
How close did you get to the stated uf, (Microfarads), and voltage?
2) As I am sure you are aware, it is the Electrolytic paste going bad inside, and forming a gas, (Hydrogen Gas), that expands, and swells the cap's case. Sometimes though, there are no visual signs of failure, as the paste just dries up inside.
3) Capacitors are used as Filters or Voltage Regulators.
Ones in the general area around the CPU, are part of the motherboard voltage regulator circuit, and this part of the motherboard voltage regulator circuit is for the CPU. (However read on) These caps are in a Series circuit. Just takes one cap to be bad, and the circuit fails.
The caps around the expansion slots, and ram slots are in a Parallel circuit. Takes more than one going bad to mess things up.
However, just to add confusion to the matter, the motherboard will Not have the motherboard voltage regulator circuit capacitors, that handles each specific hardware component, IN it's general area.
For example, the part of the motherboard voltage regulator circuit that handles voltage regulation for the CPU, may have capacitors located across the board from the CPU, plus the one's that surround, or are in close proximity to the CPU.
There may be a cap that regulates voltage for the CPU, and it could be clear over on the other side of the ram slots, or down next to an expansion slot.
The motherboard voltage regulator circuit, has a high ratio of being what fails, when a motherboard goes bad.
The motherboard voltage regulator circuit is composed of Chokes, Transformers, and Electrolytic Capacitors. The Electrolytic Capacitor, (Radial Aluminum Electrolytic Capacitor), is the Weakest link.
Especially when the world market was flooded with a deluge of bad Electrolytic Capacitors, and they are still cropping up today in all kinds of electronic components. Not just computers.
Point? You may want to follow the above link, and see if you can figure out the voltage regulator circuit caps, and replace all of those that didn't get replaced, or replace every cap on the motherboard.
Sounds extreme, huh? Understandable.
But how much do those caps cost? How much does a replacement board cost of equal value. (About the same as all of the caps, probably)
Is this just to see if you can do it?
[ I'm a computer geek, and I probably would. In fact I have, but not to the extreme of replacing all the caps. It could be the motherboard chipset next, (Northbridge/Southbridge chipset), so you have to keep things in perspective. You won't be replacing the motherboard chipset. But if you do, WE ARE FRIENDS! lol!]
Video processor being what? The Nvidia GeForce 6100, Northbridge chip? Under the 'Meat tenderizer' heatsink. Large one on the side towards the I/O ports?
Are YOU sure the PSU is good? No doubt in your mind what-so-ever. A PSU with a weak voltage power rail will light LED lights, maybe spin fans, but will not have enough power to turn the Processor on. No Processor, no video signal.
Just stating in case you pulled a PSU out of your parts pile, to see if you had those mobo's fixed.
First turn off power to the outside unit and use a screwdriver or something that you can reach the fan blades with and make sure the fan rotates freely. If it doesn't you probably need a new fan. Next check the capacitor. If it looks swollen, it's bad. If it's not swollen then you will can use a multimeter with the capacitor test function and check it. You can also take it to a heating and air supply and they will test it. Some units use a double capacitor that runs the fan and the compressor so you will need to take note of where the wires connect to it.
check all your memory sticks, reseat them in thier slots, also reseat any addin cards (video,sound card, etc.)
I would also have the powersupply checked before i acuse the motherboard..all the lights can come on , and if the power supply is missing one of its' voltages, the computer wont start. causing just what you described.
physically inspect all the capacitors on the motherboard (lil round can looking components), particularly the ones around the CPU fan: if any of these are swollen OR swollen & leaking fluid the motherboard will most likely have to be replaced.
After you remove the back cover inspect the power supply board for swollen or bulging capacitors.Pull and check any capacitors that you suspect to be swollen.Next, look for a sticker in the back side of the TV set.Use the values you find on the sticker to calibrate the voltages on the power supply board.
After you remove the back cover inspect the power supply board for swollen or bulging capacitors.Pull and check any capacitors that you suspect to be swollen.Next, look for a sticker in the upper right hand side of the TV set.Use the values you find on the sticker to calibrate the voltages on the power supply board.
Make sure you have used the proper Fan connection on the motherboard and that you used all the pins in it. Usually it consists of 3 to 4 pins for CPU fans. Does your Fan have 3 pins? If not then it is not compatible for Fan Speeds. Also check your BIOS for Fan adjustments.
Hope this helps.