Question about HP Pavilion A520n (DW233A#ABA) PC Desktop

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Will not start; suspect motherboard or start swithch

The start switch will not stay on (blue color) and the cpu will not start.

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I had the same problem with my computer. It was the on/off switch. To avoid having to buy a new switch, I just used duct tape to hold the switch in place and have the computer set to shut down on it's own.

Posted on Mar 16, 2008

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When turning computer on, fans start then shuts down with one long blue light flash around power button. Suspect power supply


You could be right in your analysis, however, before replacing the PSU unit (a weak point with both Medion and E-machine computers) check the following:

  • That the Power button is not sticking in the case
  • Inside the computer case, the PW wire is firmly making contact with the motherboard (switch to motherboard 2 pin wires)
  • That the PW wire does not have a kink in or is broken giving an intermittent fault
After checking those:

  • Disconnect HDD, DVD Writer, remove 1 stick of ram and test with each removed, replacing each in turn. If the computer still does not boot, then check the ATX connector to the motherboard and the 4 pin auxiliary CPU connector (black and yellow) if fitted
  • Remove the motherboard and check underneath to make sure there are no items of metal that might be causing the board to short out. Check the board underneath for signs of blacking or burning.
  • Replace the board and refit all connections.
  • Inspect the capacitors on the board (small cylinders) if any are bulging at the top, leaking and with a brown residue, the board is failing and will need replacement.
  • Finally, remove the PSU and test with a known good one.
  • If this fails and the board shows no blowing capacitors, the problems may now lie with a blown CPU or micro damage to one of the motherboard circuits

Jul 18, 2011 | E-Machines T6520 PC Desktop

1 Answer

Cpu fan works, power supply fan works why wont' computer come on?


Could be a number of reasons:
The CPu fan and the PSU fans will come on, even though the system is not working. There is a possibility that the CPU has blown, you can check this easily by (carefully) feeling the heatsink after it has been running a while. A dead CPU will not use power and therefore not heat up. If after say 10 minutes of running, the heatsink is clay cold, suspect the CPU. Replace with another one, spreading CPU grease on the top before putting the heatsink back on.

A blown CPU will usually be indicated bu there being NO beeps from the system (see below)

If the CPU appears to be generating heat, visually inspect the board, look for blown or blowing capacitors (the small cylinder like components) on the motherboard, any that are bulging or leaking a brown residue, or have blown, will render the motherboard inoperative.

If these appear ok (they still may be damaged), unplug all components except the hard drive, and ram and video card, see if the system then boots. If it does, proceed to re-installation of each in turn, until the faulty peripheral halts the boot.

Listen for any beeps as the ssytem switches on these beeps describe the type of problem
(repost if you hear any beeps)

Remove one stick of ram and try rebooting, if it works, suspect the ram module, try the other and see if that makes any difference.

Failing that, your last recourse is to power the system off, remove the bios battery, replace after 2 minutes and see if clearing the Cmos "unsticks" the computer.

After That, suspect the motherboard is dead.

Apr 25, 2011 | PC Desktops

2 Answers

On/off button for hp pc fails


I worked on an older system and it could be a bad motherboard

Nov 14, 2009 | PC Desktops

1 Answer

Gateway 702GE desktop When i push the front botton to start it up,the fans start to turn and then stops with no operation. The small green led on the motherboard stays lit and green and the front start...


try removing all the cards from the expansion slots and remove the ram sticks. disconnect the drive cables from the board but dont touch the cpu or power connectors. Now hit the button. If nothing changes, probable board fault. If it now boots up and starts beeping ( which it will when no ram sticks installed) shut it down and reinstall each drive connector, ram stick and card one at a time booting between each item. when the faulty item is connected, the board will stop booting and you can replace that item. Many things can also cause this. Bad connections to ram sticks and video cards, damaged usb port connections, failed cpu's, failed psu's etc.. You may still have to take the machine to a professional repairer to have the problem diagnosed.

Nov 02, 2009 | Gateway 702GE PC Desktop

1 Answer

I have a dell C521 tower,switch it on but light stays on orange,fans work but it wont switch on.help.


Hi,
if the light remains Orange, Possible In Standby/Sleep/Hibernate Mode.
Try pressing And Holding The power Button For 4-5 seconds Or more.
If this Fails, remove the power Cable, remove side-panel ( Unless Warranted ) locate the silver cmos battery, on the motherboard. remove the battery for 10 seconds, replace and repower and startup. failing this i,d suspect the ram/memory or cpu.

Mike @ Compurepair.

Oct 29, 2009 | Dell Dimension C521 PC Desktop

1 Answer

I'm doing a memory upgrade. i have four memory slots, 2 blue and 2 black. i have two, 2g dimms; for dual channel operation do i use the 2 blue slots or the first blue slot and the first black...


Try them in the same-colored slots, nearest the processor. It seems ASUS (who makes your mobo) has chosen to color code their slots so those of the same color enable dual-channel. If you can't tell from the BIOS detection, try CPU-Z to verify that the memory is in the correct slots for dual-channel operation. Putting one in the wrong slot should not damage anything. It would just make it so you can't take advantage of the extra speed.

Oct 24, 2009 | HP Pavilion A6430F Desktop PC

1 Answer

Pc wont boot up, instead a red light flickers.


Flickering LED means power supply is overloaded with something. It might be inside of the supply, but sometimes it is something else. Try that:
1. Disconnect everything from the motherboard except power supply and power button;
2. Disconnect all power connectors from all drives;
2. Remove any cards from the motherboard so all you have is power supply and motherboard with CPU and RAM, nothing else. You can keep connected the monitor and keyboard;
3. Press Power button. Will motherboard turn on normally?

If no - check electrolytic capacitors especially around the CPU, if some of them are "popped" replace them.
If yes - connect drives and cards one per time to localize the problem.

Sep 14, 2009 | Compaq Evo D500 PC Desktop

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