Diagram of cords inside of tower

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.

Other Thoughts
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Usually P3 and P4 refers to a cable on your power supply that needs to be attach to your motherboard to supply extra power.

Note:
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.

as much as i want to help you, there is too many cables inside a computer and i dont know which one your referring. as you said everything is unplugged we can make it work but that is complex discussion to start with

check to make sure none of the pins on your vga cord are bent. if ok check to make sure your video card is fully seated. also if your computer has built in video and also has a video card in it try other vga output

That is the standby mode but if its not kicking out of standby mode it could be a fuse issue

The T300 uses a 2.5A fuse.

To replace the fuse:

1. Unplug the AC cord from the AC power source,

then remove the AC power cord from the speaker's

power connector.

2. Remove the fuse cap with a small, flat blade screwdriver

(see diagram 2).

3. Remove the fuse from the fuse cap

(see diagram 3).

4. Replace the fuse inside fuse cap with another metric

5X20mm size fuse

5. Replace the fuse inside the cap, replace the fuse

and cap in the power connector (see diagram 5).

6. Connect the AC power cord to the speaker and

raise it upright.
7. Connect the power cord to an AC power outlet

its the mane box in back of computer that the mane tower cord plugs into.

One bad/faulty lead can cause a computer with lots of problems
replace all the leads that attach to your hard drive including electrical extensions + IDE,SATA the ones that attach from your motherboard to hard drive
make sure all leads that are attached to your drives dvd\cd 3 1/2 inch floppy have secure connections and are not faulty or just replace them they are probably old and faulty ?
hope this helps

If you are referring to how to properly connect the power cord to your dryer, the following link explains how:

http://www.fixya.com/support/r3575913-installing_a_220_vac_appliance_cord

Please note there are TWO different types of appliance power cords. There is a three-prong configuration and a 4-prong configuration. These appliance power cords can be purchased at any hardware store. Just make sure that whatever power cord you purchase matches the receptacle you have in your home.

If you need a wiring diagram of the dryer, the manufacturer usually includes one inside the operator console. Just remove the back panel of the operator console and one should be there.

If you have any questions, please post back and let me know.

NOTE: I believe your model number may be "GEQ8858EQ0". I could not reference anything to the one you provided.

The Dell 725 printer power cord does NOT plug in to the tower. The Video Cable, on the other hand, plugs in to the tower's video output. Look for a connector like the one from the printer (often USB these days) to plug it in to the computer. There was a diagram that came with the computer that showed how to do all the connections, and the Power Cord does NOT plug in to the tower. USB connections are in various locations on your computer's tower, in the back and sometimes in the front too.

hello i got the same problem like u,but the thing is i call some1 2 check my p.c and he took my power supply and never give back 2 me,can u let me know that serial # or any info about the power supply....thanks or if u bought 1 4 u...........

... Well, first things first, are your keyboard and mouse USB or PS/2? Chances are if it's a really old computer it doesn't have any USB ports. You would then need either 2 USB to PS/2 adapter (typically small green and purple adapters) or PS/2 keyboard and mouse.

Hope this helps!

Alex J.