Check the power cables frm the smps connecting the motherboard and cd/dvd drive ..... also reseat the hard drive
When
you plug in the power cord is there any lights whatsoever on the computer?
When you press the power button do you hear fans running, hard drive spinning,
lights on the computer, hear any beeps or lights constantly blinking, hear the
DvD/CD drive click and the light on the drawer of the DvD/CD turn on for a
second or two? If so the laptop is trying to boot 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 the computer
and why it is not booting. Most times it's a motherboard issue when you
hear beeps or blinking lights continuous. Most times the problem is with
the memory or Video Card. Count the Blinking Lights or Beeps and take note of
their pattern (1 Long or 1 Long followed by 2 Short).
Maybe your power cord is bad if you don't get anything to happen whatsoever
when you press the power button.
Maybe
you have a Static Charge Buildup. Remove the Power Cord, then Press and
Hold the power button for 30 seconds. After 30 seconds plug the power
cord back in and hit the power button to see if it boots.
Maybe
your memory is bad or the memory slot is bad.
Remove
the Power Cord, Open the Case and remove one of the memory chips. Set the
chip aside then try rebooting the computer. If it boots, then you know
the memory chip you set aside is bad so mark an x on it with an ink pen.
If it fails to boot then move the chip to the next memory slot and try
rebooting. If it fails take the chip out and set it aside, then put the
other chip in and try booting it in both slots. If it boots, just to
verify that the chip set aside is bad, mark an x on it and put it into the open
memory chip slot and try booting.
Maybe
your power supply is bad. Sometimes there is enough power to make the
power light or some other lights come on but not enough power to make the fan
turn on or hard drive spin.
Below are links and info I found from Dell's Website based on your model.
http://support.dell.com/support/edocs/systems/dime521/en/SM_EN/specs.htm
Controls and Lights
Front of computer:
Power button - push button
Power light
green light - Blinking green in sleep state; solid green for power-on state.
amber light - Blinking amber indicates a problem with the power
supply inside the computer. If the system cannot boot and there is a
solid amber light, this indicates a problem with the system board (see
"Power Problems" in your Owner's Manual).
Diagnostic lights
four lights on the front panel (see Diagnostic Lights.)
Standby power light
AUX_PWR_LED on the system board
Hard-drive activity light
green light - When the computer is reading data from or writing data to the hard drive.
LAN indicator light
green light - Solid green indicates that a LAN (local area network) connection is established.
http://support.dell.com/support/edocs/systems/dime521/en/SM_EN/adtshoot.htm#wp1056411
Test your PSU or replace it if your power supply units fan is not working your PSU is faulty
One bad lead can cause a computer to continue on a cycle or to shutdown or fail to detect your hard drive
Test the leads that attach to your ((hard drive from the motherboard)) or replace all the leads that attach to your hard drive including electrical extensions + IDE,SATA and 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 even the electrical extensions or just replace them they are probably old and faulty a computer needs its connections to have an end so any faulty leads will end up with a computer error
hope this helps
dont forget to vote
Test your PSU or replace it if your power supply units fan is not working your PSU is faulty
One bad lead can cause a computer to continue on a cycle or to shutdown or fail to boot
Test all leads that attach to your hard drive including electrical extensions,IDE,SATA
the leads from your motherboard to your hard drive make sure they have a secure connection and are not faulty or just replace them there probably old and faulty
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
Test your PSU or replace it if your power supply units fan is not working your PSU is faulty
One bad lead can cause a computer to fail to detect a hard drive continue on a cycle or to shutdown
Test all leads that attach to your hard drive including electrical extensions,IDE,SATA and
the leads from your motherboard to your hard drive make sure they have a secure connection and are not faulty or just replace them there probably old and faulty
problems
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
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new ps does not work( no change) if i unplug the 20 pin conecter from mother board and ground the green wire(po) cdrom drive works
ps has same wire colors.unlplug cdrom and leave power conected and cdrom will open, but nothing on screen. not sure about history of pc its a friend of mine. use static strap and bench with card board bottom.it is full of dust so no it has not been cleaned.
I need to ask some additional questions, and propose some tests. 1) Have you had problems with your computer prior to this? 2) Have you changed any hardware inside your computer, or cleaned the Processor, and Heatsink, and applied fresh thermal paste, or cleaned the inside of your computer? 3) If you did so, did you have the computer unplugged from power, And did you observe anti-Static precautions by relieving your body of Static? {Work on a table. Touch the metal frame of the open computer case, prior to reaching inside the computer. If you get up in the middle of working on your computer, walk away, then return, touch the metal frame again. If you have a carpeted floor underneath your table, refrain from swinging your feet back, and forth} 4) Is the 4-pin ATX power cable from the Power Supply, plugged into the motherboard? {Looking at the motherboard with the Processor to the top, Ram Memory to the right, there is an aluminum finned Heatsink below the Processor. To the Left of this Heatsink, is the square white connector on the motherboard, where the 4-pin ATX power cable plugs into} 5) Is the new Power Supply - compatible with the Asus P4G533-LA motherboard that you have, In That, the 20-pin ATX power cable connector from your power supply, has the color code of the wires the same as the old power supply? To clarify this last statement: For a period of time HP changed out where the wires go in their 20-pin ATX motherboard power cable connector. Their computer parts were made to fit that computer. Yellow is 12 volts, Red is 5 Volts, Orange is 3.3 Volts, and any Black wire is a Ground wire. {The Green wire is the Soft Power On wire. Connecting it to a ground with the power supply plugged into power, will turn the Power Supply on. Hence why your CDROM works. It uses 12 Volts, by the way} Look at the old power supply's 20-pin connector, color code of the wires. Compare where they go the socket holes of this old connector, compared to the new power supply's 20-pin connector. The color of the wires must be in the same socket holes, for the new power supply connector, as it is in the old power supply connector. Using a power supply from an aftermarket power supply manufacturer, that it's 20-pin connector color code of the wires, does not match up with the old HP power supply 20-pin connector, will result in frying out the Motherboard, and possibly the Processor, Ram Memory, and graphics. If this statement holds true, it may be that you had a bad power supply, and have now plugged in a power supply that it's 20-pin ATX motherboard cable connector, did not have the correct wire placement, and the computer could now be toast. Hopefully this statement does not hold true. Just something to check on. 6) Do you see any bad Capacitors on the motherboard? This is a link that shows you what Electrolytic Capacitors look like, and visual signs of capacitor failure,http://www.capacitorlab.com/visible-fail...
Bad power supply. Has a weak voltage power rail. 1) ALL the lights use less than 1 Watt of power. 2) EACH fan uses 2 to 3 Watts. 3) A typical Processor uses 55 to 125 Watts, depending on what Processor it is. You don't even have enough power to open an optical drive. Replace the power supply. If you would like to do a test that requires a $12 power supply tester, let me know. Just state so in a comment.
I would like you to remove that flat ribbon cable, (Interface cable), from the CD and DVD drives. (Power to DVD drive also) Use Q-tips to dislodge the heavy gunk inside the computer, then follow with a can of compressed air for computers. Take the ram stick/s out, clean the gold plated contacts with a pencil eraser. Clean the ram slot/s out with air, reinsert the ram stick/s. Use a jumper wire to bypass the Power On switch. There will be a spark, notifying you in advance. I use an insulated jumper wire that is the same gauge as one of the power supply wires, about three inches long. 1/2 inch of insulation stripped off of each end, ends twisted tight, wire bent into a U shape. One end is inserted way down into the socket of the Green wire, in the 20-pin ATX power cable connector. The 20-pin connector is plugged into the motherboard. Has to firmly touch the metal pin connector, that is way down in there. Then with the wire firmly stuck in position, I plug the power supply into power. Now the other end of the wire goes down into a socket hole that has a Black wire. There is a Black wire right next to the Green wire, but ANY Black wire will do. The Green wire is the Soft Power On wire. Any Black wire is a Ground wire. You are just completing a circuit, and bypassing the Power On switch. If the Power Supply is KNOWN to be good, (You can get a bad one, even if it's new), and you bypass the Power On switch, the Power Supply will come on. IF it Doesn't with the 20-pin ATX power cable plugged into the motherboard, and Does with the 20-pin ATX power cable unplugged, then I suggest the motherboard is toast. (This is with the inside of the computer cleaned out thoroughly)
Tests: Computer unplugged from power, computer case open, de-static your body. Remove the interface cables from your optical drive/s, and power cables. Remove the interface cable from your harddrive, and it's power cable. Make sure the 20-pin ATX motherboard power cable is plugged in. If you still have that jumper wire to the green Soft Power On wire, remove it. Plug the computer into power, do not reach inside the computer while plugged into power. Not only is there a safety hazard for you, but also for the computers hardware components inside, should you reach inside, and touch anything. Press the Power On button. Do you get the BIOS POST screen? (Additional info about the wires that go into a 20-pin ATX power cable connector, and also you can scroll the page all the way to the top, and click on the - 4-pin ATX +12 volt power cable for more info on it,http://www.playtool.com/pages/psuconnect...
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