The power went out in my room and then I got it back up. I tried turning it on and the computer won't turn on, but the monitor works fine. I tried inserting a different power supply and it still doesn't work.
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Re: Computer turning on?
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.
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A monitor does not normally save any states such as sleep. If unplugging the monitor from the power source for ten to twenty minutes and re-plugging it in does not fix the problem check and see if the monitor's menu comes up. Even in sleep mode, the menu for the monitor should show. If it does, try resetting the monitor to factory default settings. If the menu does not show up, then there is an issue with the monitor.
Your screen might be going bad. Try plugging an another monitor and see if it works or has the same problem. If the other monitor works, it's definitely your screen is bad. If the other monitor fails and does the same thing, then the video card in the computer is bad.
Shut pc down unplug power supply press and hold power button for 20 seconds to remove all remaning power.open case clean any dust find ram sticks remove them make sure there clean and re seat them back into there slots.your monitor could be the cause also unhook it while pc is unplugged. now put it all back together and turn it on..if it doesnt shut it down un hook monitor and fire up pc see if the pc boots by watching the lights.if so bad monitor does light turn blue on monitor when power on.
Any time a monitor says "no signal" that message is originating from the monitor itself, and not from the computer. A monitor in a room by itself with no computer will say "no signal" for a brief time, if it is turned on. So, if you have tried other monitors also with no luck, then the problem is either the video adapter of the computer, or something that is keeping the computer from booting in the first place (power supply, hard drive, memory, motherboard). A power supply can be tested with an inexpensive tool. Everything else needs either a swap out with a known good stand-in, or else an expensive tool to know if it works.Does the fan come on when you turn the computer on? If so, maybe more likely to be the motherboard, hard disk, or memory. If not, more likely to be the power supply.
First double check to make sure no cords came loose - you may even want to unplug and replug the power cable both out of the computer and the wall.
If you do not have a loose cord, listen closely when you attempt to turn the computer on - is it making any noise? Do any lights come on? If not, you likely have a bad power supply.
If the computer does come to life, just no reaction on the screen, make sure your monitor is plugged in and turned on, and try unplugging and replugging the cord connecting the computer and the monitor.
If this still does not get it, you may be dealing with either a graphics card or monitor problem. If you have an alternate plug for the monitor to go - try that, or if you have a different monitor to use, try that.
This should either greatly narrow down or fix the problem for you.
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.)
Unplug all the cable from the Computer,
Press and Hold the Power button for 30Sec. without connecting any cable,
Connect the Power cable and Monitor cable then turn it back on,
see if your computer turn on or if you get any thing on Monitor,
if you hear any beep sound or any thing after doing all this
let me know i will be more that happy to help u.