Be sure that the ATX or BTX power cable (the rectangular cable with 20 or 24 pins) is securely fit into the motherboard. Re-seat it if needed. Also, check the +12V 4-pin adapter (if exists) is seated, just like the 20/24 pin is. If that doesn't solve the problem, be sure that the PSU is switched on and is at 120V (USA) before plugging in the power cable. If that doesn't work, contact the computer manufacturer or the PSU manufacturer (depdending on what you purchased.)
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Sometimes if a VGA cable is not screwed into to both your Tower and your Monitor, it can get loose and thus resulting in no signal.
Another cause of a Monitor Displaying the no signal message would be due to the Graphic Card failing, or possibly due to the Graphic Card not correctly being seated.
Usually P3 and P4 refers to a cable on your power supply that needs to be attach to your motherboard to supply extra power.
If your P4 cable is not plugged in before turning on your computer, this will also result in your Monitor displaying the no signal message.
Keep in mind though, if your computer has not been opened or is not a custom built PC, you should not have to worry about such issues as your P4 cable should in theory be connected. However I guess safely checking won't hurt anyone.
If the fan is not spinning this can be the issue ...but it can also be the motherboard itself ..if you have the possibility try to change the fan ..cause if it fails to start the computer will also fail cause the cpu it will shut down the system instantly if it has no cooler working ..(gets to the shut down temperature in one sec or so ) If it seams that it is trying to start ..but , like I said , it shuts down ..just try to change the fan ...but it may be a issue with the power supply or the motherboard as well...
I would re-seat the power connector from the power supply to the motherboard. If you are able to test the power supply output, that would be helpful as well. The problem as you describe it points towards the power supply failing.
it could be that your power supply (from tower) is not working -- does the fan blow out air ?
if not replace the power supply. If the power supply is on but no video on screen showing , it could be your mainboard inside the tower, thats if no noise is coming from the tower.
what were the circumstances when you worked on he computer ? was it plugged in overnight while running or was the power cord attached to tower while plugged into wall ? if so, it mnay have experienced a power surge and blew the mainboard.. too much current going to tower could blow the power supply, causing the mainboard to have received excess current
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Hi! Try to check if there is any power light or any lights on the machine whenever you try to turn it on, also, try to directly connect the power cable directly to the wall outlet.If you have a spare power cable try to use it.If you are getting the same result, try to unplug the power cable at the back of the computer, press and hold the power button for 10 secs and after that plug the power cable back in and then try to press the power button.Check for indicators if the system is getting power for example, check lights, check if the fan is spinning at the back, check if the dvd/cd drive will open or check if the tower is emitting any sound.If still the same and still no light coming from the tower then it might be a issue with either the power supply or the motherboard, you can call your manufacturer and have the machine serviced if its still under warranty.Hope this helps...
is your powersupply overloaded by extras (e.g a new graphics card/processor) ? or has it simply given up the ghost? the pc could also be drawing alot of powewr form you electrics and could've blown a fuse in your power socket/too much demand. you could also try and update your bios chip. you need to be a bit more specific aswell ;)
Not all computer power supplies have a switch on the back. Unplug the computer for a minute, then plug it back in and try again. If still no result you have a bad component somewhere. No way to tell for sure which one without opening the case. Likely culprits: power supply, dust build-up, components need to be reseated, memory, video card, or motherboard failure.
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.
The P7 plug is likely a spare for additional drives. You are experiencing a no POST (Power on Self-Test) when just means the system fails to turn on. Since it is summer, it is lightning season, and a lot of systems experience failures due to lightning.
Things you can do.
1. If the system has a modem, and the phone line was connected to a telephone outlet, remove the modem card from the system, see if it will now turn on. If no different, disconnect all items plugging into the tower except power, try again, if it turns on, then power off, try attaching items one at a time till you ID the problem device.
2. If the system still turns off immediately, then the next suspect item is the power supply in the tower. Most towers now days use an ATX power supply that costs about $30 and can be bought either at a local computer shop or on-line at places like newegg.com