Pc wont power up

A good idea would be to unplug it and then plug it back in to ensure it is secure. Another thing you can try is to plug the cord into another outlet. After you’ve checked the power outlet in the wall, ensure the cord securely connects to the back of the TV

Here's some tricks I would try...
1. Verify the monitor's power cord is plugged firmly into the wall outlet and the back of the monitor.
2. Verify the monitor cable is firmly connected to the computer and the monitor.
3. Verify that you have turned the monitor power switch on.
4. If the power light on the monitor is not on, test the wall outlet (plug in a light or something you know works).
5. If the power light on the monitor is not on, try a different power cord.
6. If the power light is on and yellow or orange or flashing, but nothing displays, or the display is incorrect, borrow a monitor from a friend. If that works, your monitor probably needs replaced.
7. Also, you could try your Monitor on a friend's computer. If it doesn't work, your monitor probably needs replaced. If it works properly on your friends computer, the problem may be with your computers video output port, motherboard video chip (or video card, if you have one), or drivers.
Good luck.

It could be the monitor. Try a different monitor. Here's some tricks I would try...
1. Verify the monitor's power cord is plugged firmly into the wall outlet and the back of the monitor.
2. Verify the monitor cable is firmly connected to the computer and the monitor.
3. Verify that you have turned the monitor power switch on.
4. If the power light on the monitor is not on, test the wall outlet (plug in a light or something you know works).
5. If the power light on the monitor is not on, try a different power cord.
6. If the power light is on and yellow or orange or flashing, but nothing displays, or the display is incorrect, borrow a monitor from a friend. If that works, your monitor probably needs replaced.
7. Also, you could try your display on a friend's computer. If it doesn't work, your monitor probably needs replaced. If it works properly on your friends computer, the problem may be with your computers video output port, motherboard video chip (or video card, if you have one), or drivers.

Good luck.

Try another monitor.
Here's some tricks I would try...
1. Verify the monitor's power cord is plugged firmly into the wall outlet and the back of the monitor.
2. Verify the monitor cable is firmly connected to the computer and the monitor.
3. Verify that you have turned the monitor power switch on.
4. If the power light on the monitor is not on, test the wall outlet (plug in a light or something you know works).
5. If the power light on the monitor is not on, try a different power cord.
6. If the power light is on and yellow or orange or flashing, but nothing displays, or the display is incorrect, borrow a monitor from a friend. If that works, your monitor probably needs replaced.
7. Also, you could try your display on a friend's computer. If it doesn't work, your monitor probably needs replaced. If it works properly on your friends computer, the problem may be with your computers video output port, motherboard video chip (or video card, if you have one), or drivers.

1. Verify the monitor's power cord is plugged firmly into the wall outlet and the back of the monitor.
2. Verify the monitor cable is firmly connected to the computer and the monitor.
3. Verify that you have turned the monitor power switch on.
4. If the power light on the monitor is not on, test the wall outlet (plug in a light or something you know works).
5. If the power light on the monitor is not on, try a different power cord.
6. If the power light is on and yellow or flashing, but nothing displays, or the display is incorrect, borrow a monitor from a friend. If that works, your monitor probably needs replaced.
7. Also, you could try your display on a friend's computer. If it doesn't work, your monitor probably needs replaced. If it works properly on your friends computer, the problem may be with your computers video output port, motherboard video chip (or video card, if you have one), or drivers.

1. Verify the monitor's power cord is plugged firmly into the wall outlet and the back of the monitor.
2. Verify the monitor cable is firmly connected to the computer and the monitor.
3. Verify that you have turned the monitor power switch on.
4. If the power light on the monitor is not on, test the wall outlet (plug in a light or something you know works).
5. If the power light on the monitor is not on, try a different power cord.
6. If the power light is on and yellow or flashing, but nothing displays, borrow a monitor from a friend. If that works, your monitor probably needs replaced.

• Nothing is more annoying than a monitor that refuses to turn on. Make sure your Acer monitor is plugged in to a functioning outlet. If it's plugged into a power strip, try replacing it with a new one or moving the plug to a different outlet. Ensure that both ends of the power cable are plugged in firmly and securely, and that the connection to the monitor is not loose.
  

Cable Issues

• Your Acer LCD monitor will usually accept DVI and VGA inputs. If you have an older computer, a VGA cable should work fine. If it doesn't have a VGA port, you'll need to obtain an inexpensive DVI to VGA adapter at your local computer store. A DVI cable, however, is compatible with most modern computers and offers superior picture quality over VGA. Make sure you're using the cable that's compatible with your system, and that you have the proper conversion adapter, if necessary.
  

So it sounds like it's heat-related. Does that video card use a cooling fan? Is the fan still working? Maybe the PC needs cleaning out, you might be amazed at the amount of dust that can build up inside the case.

If you're cleaning be careful not to dislodge anything, or create electrostatic zaps. Leave the power cord plugged in to provide an earth, but turn off the power point. A new 2-inch paintbrush is good for brushing dust out.

If the card has a fan it could be clogged with dust, or may have died altogether. Find someone who knows how to clean or replace it, if that is the case.

If you dont see any green lights and you dont hear any boot up sounds ( hd, fans, etc) try to take out battery and just plug in the AC adapter to a known good power outlet. Make sure your power plug is good too. If you hear boot-up sounds, see green lights but no display then toggle on the "fn" key and or try on an external monitor.

we need to open the case and inspect the cables and cards and memory to make sure nothing has gotten dislodged. heres how to get into the case.
Before Opening the PC
1 Remove any diskette or optical disc (CD or DVD)
from the PC.
2 Disconnect the modem/telephone cable, if present.
CAUTION: To reduce the risk of personal
injury from electrical shock or hot
surfaces, disconnect the power cord from
the wall outlet, and allow the internal
system components to cool before
touching.
3 Disconnect the power cord from the electrical outlet
and then from the PC.
4 Disconnect all other attached cables (such as the
keyboard, mouse, and monitor) and all external
devices.
Removing the Side Panel
1 Remove the side panel by loosening the screw on
that secures the panel to the PC chassis.
2 Slide the panel back about 1 inch (2.5 cm), and
then lift it off the unit.
WARNING: Beware of sharp edge

Once the side panel is off you will see the computers internal parts. Follow all the cables from the power suppy (top rear of tower) to th devices on the other end and make sure all are COMPLETELY in the sockets. Now do the same with the rest of the ribbon cables.
Now check all add-in CARDS installed into slots on the main boardand make sure they are ALL the way into there slots, sometimes these gets jarred or bound by the case and will work thier way loose.
Last check the RAM, the small rectangular shaped sticks with chips on them installed into similar slots on the main board, these can be up just a tiny bit in thier slots and the computer will freeze.
While you have the case open take note of any burnt smells or apparent swollen parts (capacitors), fans not working (inside & out).
It could also be your power supply going out, ive seen em light up the light on the mainboard , but not have any power to the harddrive and lock a system up.
Go through these things , it might be these , it might be something else, but its good to know your computer is clean and all mechanics in it are working visually from time to time. i can of compressed dust remover spray goes a long way to clean out those dirty fans and heat syncs underneith them.

try this and post again ....