Seemed to be a problem with the power supply so I replaced it. No joy. The power supply fan comes on but nothing else does. No power light on the front but the hard disk light comes on yellow. Then it doesn't shut off. I have to unplug it to shut off the power. Any ideas? Thanks.
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hey, without seeing it its quite hard, if the cpu fan aint running you have either not connected the cpu fan cable up, or connected it to the wrong place, are you sure you fitted the cpu the correct way round when you removed it,
and depending on the processor in the computer make sure you aint damaged any of the pins etc on the cpu.
if you can supply some pictures or something can probably help you better
If you have one of those generic motherboards with Intel chipset, socket 478, 2 or 3 PCI slots in a mini ATX form so, don't waste your time and buy a new one. Some time ago I replaced it with a cheap Biostar P4M80-M4 and is much better.
what u may have done is wwhen u were installing the new board, gave a static shock to the system...that will cause only the fans to come on and nothing more...this is a bad problem bc u cannot fix it...if u figure out something else is wrong, and it gets fixed, let me know
You ask for two problems here, but let's talk one by one.
According to your explanation it seems to be bad wall outlet connector, broken power cable and finally a broken Power supply.
You can check first two, but to you can't check Power supply.
The point the status led is off means that the 5V part of the power supply is broken. 12V part is (probably) OK because you have a fan running for short, but it is not important because all power sources of the power supply should work.
Now, the best for you is first to (try) buy a new strong power supply (you said you have more devices in your PC) and try with another power cable connected to another wall outlet.
First you should see if you get a status led ON. If so, than your PC should work.
three beeps suggest bad memory (it depends of the BIOS). If you have more then one module, try with one only and then with oders, but only one at time.
It's hard to troubleshoot a power supply. They are very dangerous and contain electricity for some time after turned off. If your new one isn't solving your problem it makes me think it's not the power supply unless it's not powerful enough. Try this:
Open your case having your "CPU & HEATSINK" in sight. You can lay your case on its side if its easier to see this. Power up watching only the cpu fan located on or in the attached device over your processor (cpu). If it doesn't turn then that is likely your problem. CPU is overheating which automatically shuts down system. Pls. make sure both 20-24 pin and 4 pin plugs from power supply are tightly plugged in mother board before you start.
If it is working try another power outlet in your house. Sounds odd but is a known issue.
Could be a few more things but these are most common.
Let me know pls. your results.
Did some research and found this site which will tell you which pins to test. It is possible also that its not powerful enough for the devices you have. I would try again only giving power to the motherboard pins, of coarse and the hard drive. If works then plug one device at a time.