I am assuming you have chosen power supply powerfull enough to handle all the power consuming hardware instaled in the PC. Please try unplug all connectors from the motherboard and plug them back again. Sometimes this solves the problem.
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You can install the power supply from another computer provided the wattage is equal to or greater than the original one. The only problem you may have is the physical size og the power supply. The desktop computer power supply is usually larger in size to the smaller compact computers. You won't know until you remove the power supplies from both computers. You can also purchase power supplies from computer repair shops or on the Internet.
Do you mean the monitor's power light starts green and then turns orange when you turn it on? Most monitors will go to a power saving mode when they do not get a signal from the computer.
The Dell GX260 has a green power light when on. When the computer is off, the light is off. If it is green and blinking, then the computer is in a power saving mode.
Diagnosis: start with the obvious: is the monitor cable plugged into both the computer and the monitor (if not permanently connected to the monitor)? Are you connected to the active port? (You can add a video graphics card in most desktops. The motherboard video port usually needs to be disabled to use the card ports. If you plug in the monitor cable to the disabled port, it won't work.) Is the monitor set to the correct input? (This applies if the monitor has several ports. In that case, there will be a Source or Input button on the monitor.) Is the computer on? The GX260 has the power button on the front. (Other computers have the power button on the top.) There is also the power supply switch on the back which needs to be on.
Next try a different data cable between the monitor and the computer (if you can). Try a different monitor. If a second monitor works, than the monitor has a damaged main board. If the second monitor doesn't work, then the video graphics adapter has probably failed. Replace the add-on card, if in use, then boot in the safe mode to remove the old graphics driver. Then install the correct driver for the graphics adapter.
Note: the computer and the monitor should both be off when you connect the cables. Then turn on the monitor first and set it to the correct source before turning on the computer.)
sounds like it could be a bearing in your hard drive. is this problem constant? If so, I would open up the tower and disconnect the hard drive and then power up the tower again. if the sound goes away--you need to get a new hard drive. If not, you could have some dust bunnies in your cooling fan.
The mains voltage is different. If the desktop has a switch mode power supply that has a mains voltage selector switch, then switch it to 110 volts and it will work, but if it doesn't then you need to purchase a switch mode power supply and install it in your computer, make sure it matches the total wattage or higher than the old power supply.
The monitor usually don't have a switchable voltage, you most likely need to buy a new monitor or use an existing one.
I would make sure you connected the Power to the main switch correctly it is usually a 3 wire connect, check all connections on the HDD, motherboard, and CD's. also check the WATs rating on your old power supply against the WATs on the new power supply, if the new one is less that is probably your issue.
The ram is not the right speed for your computer. please pull it out and make sure it is the same kind you changed it out with. The reason for all the sound is this... When you first start the computer, the fan will be really fast. As it goes into BIOS the fan slows down. So the noise stops. I know this for a fact though. I have gone through this with my computer. Also make sure the RAM is locked in it's ports and the white things are locked at the ends of the RAM. This will solve your problem. Good Luck.
When you say power supply, I assume you mean the power cable plugging the tower into your wall socket. It sounds like your actual power supply inside the tower itself has died. You will have to replace the power supply itself, it is too dangerous to try and repair a power supply, even for an experienced technician. You can find power supplies for pretty cheap online and at PC resellers, and usually a service tech to install for you, if you don't feel comfortable installing yourself.
Before you go this route, make sure you test another outlet as well.
Sounds like the power supply is faulty. Power supplies are very dangerous to try and repair, even for qualified technicians. I would also suggest not trying to plug it in or turn it on until the new power supply is in place. Faulty power supplies have been known to cause motherboards to permanently malfunction. Note: researching your issue, I came across several forum posts with complaints about emachines and their power supplies. The best way to solve this problem is to purchase a new power supply. If shopping online, www.tigerdirect.com and www.newegg.com are two places that specialize in PC hardware. A 400-watt power supply would probably more than do the trick for you. The cheapest one I found was $18.00. Make sure the power supply is compatible with your motherboard before you buy.