Power is on but I cannot hear it running and computer can't see the drive

1st, it is the monitor that says, "No Signal." That being; is the actual computer turned on?

If it has a green / red power light and you can hear the hard drive and fan running inside the computer case, then check the cable that runs from the back of your monitor to the back of your computer's case.

It may be disconnected of just bad.

If you cannot hear any noise inside the computer case or there is no power light on, then check the electrical cord in back of the computer's case to the wall. If that is good, check to see if there is a light switch that turns that socket on and off.

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It is possible that the drive has failed, or the computers power supply has failed, or maybe the memory. Usually when a computer boots, you will hear a beep. if you hear more than the one beep, it will tell you what is causing the problem, let me know how many beeps you hear, if any.

If this external hard drive uses a power adapter and when it is plugged into the mains socket and you do not get a blue light or hear the hard drive spinn then most likely the power adapter is faulty and cannot supply power to the hard drive.

Replace the fan or your computer will run hot and keep turning off.

Or are you saying this is what happens when you power on the computer? if so: When you press the power button do you hear fansrunning, hard drive spinning, lights on the computer, hear any beeps or lightsconstantly blinking, hear the DvD/CD drive click and the light on the drawer ofthe DvD/CD turn on for a second or two? If so the laptop is trying toboot or may have booted, but the screen is not showing for some reason.

Beep tones and blinking lights tells the technicians what is going on with thelaptop and why it is not booting. Most times it's a motherboard issuewhen you hear beeps or blinking lights continuous.

When you press the power button do you hear the fan running, hear the disk drive running, see any lights, do you hear the cd drive click once and see the light come on briefly on the cd drive door? If you see all the aforementioned then it is surely trying to boot. Computers don't boot mainly because of the following problems. 1) Bad Power Cord or Power Supply. 2) Electro Static Buildup. 3) Bad Motherboard 4) Bad boot or system files.
Remove the Power Cord and the battery if it's a laptop. Press and Hold the Power Button for 30 Seconds. Then replace only the Power Cord and try hitting the Power Button. If it boots you had an Electro Static Buildup. If you have boot or system files that are missing or corrupt normally the system will be telling you that on an error message that appears on the screen. Does your system show you anything on the screen when you press the Power Button? If not you have a Power Supply or Motherboard issue.

When you powered on the machine did you hear any beeps, hear the fan running, the disk drive running, lights blinking, hear the cd drive click, see the light on the cd drive door for a second or two when it clicks? If these things are happening you are getting power. If not, your problem might be with your power supply, hard drive or motherboard. Remove the power cord, then press and hold the power button for 30 seconds, then plug it back in and press the power button. if it boots you had a static charge. If you get nothing at all but a silent system your power supply is bad. If it sounds like your computer is running but you can't see anything on the screen you might have a problem with your screen or video card. If you have another monitor try using it and see what happens. if it works so you can see things then your monitor was bad. If it does not work with another monitor but you still hear fans, and see lights and hear the disk drive spinning, then your video card is probably bad.

Do you hear the harddrive start up? When you push the power button (or switch on the back) do the lights go out? If you hear fan running and hard drive start up then the computer itself might be on but the monitor isn't. Check the power to the monitor, the connection between monitor and computer to make sure they are all on and connected.

If you don' t hear the fan running then you have other problems. Any blinking lights would indicate something is getting power. I'm assuming the computer was working before the power button was pushed... If the monitor is actually working, you could hook up another monitor to check too then you have other problems but need more info to know what that could be.

would need to know the answer to the above questions as well as if it was working before, what was done, what changed between it working and this problem. Also what age the machine etc.

If you've got lights, then you probably have power, and the power supply is not the issue. I'd check the monitor by swapping it out with another one, just to insure that it's still working. If you can hear your hard drive spinning when your computer tries to boot, then its possible your hard drive got fried somehow. If you hear nothing, or maybe just hear a fan buzzing inside the PC, there's a good chance that your motherboard is shot. I've had this happen twice, due to static discharges or power outages. If the northbridge chip on the motherboard is gone, you're probably going to need a new motherboard (unless you know your way around a soldering iron).

If you are comfortable with it, disassemble your computer, and check the parts against other computers, i.e., check if the hard drive works by putting it inside another working computer. And by the same token, take a working hard drive, power supply, ect and put it in your non-working computer, and see if it boots.

If you've still got nothing, i'd bet on the motherboard, but if you want a second opinion, take it down to your local computer store, and have them run a check on it. Most places will only charge $50 or $60 bucks to run a hardware diagnostic to see what parts may or may not be working, and knowing for sure beats buying new parts which may or may not be damaged. Good luck!

Its in your logic board controller issue, usually the problem is like that but to see what is the another problem of your External Drive is to make or use any diagnostic freeware program to identify the device where it really connected in your PC. I have also encountered like your problem but I send my External to Electronic Tech to check the power connection and controller connection going to PC. Because you said that the hard Drive is still have a normal sound then it is working then but cannot see in your Computer. Try to Diagnose first before you bring to a Technician. Good luck!

I would start by replacing the power cable to the monitor. If you don't hear your hard drive then maybe the power cable to your power supply is bad or you have a bad power supply. So first make sure the cable that goes from the wall to the power supply is good. If it is good make sure the power supply is turning on. If it is then make sure that the power cable from either the wall or your computer to the monitor is good.