Question about Dell XPS 420 PC Desktop

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Computer isn't working.. with a very annoying long beep.

The lights that flash are 1 and 4, and then sometimes 2 and 3. It switches.

The beeping isn't anything like the codes I found in my manual, it just goes on forever, repeatedly. beepbeepbeepbeepbeep
I've tried un-plugging and then replugging the computer, and then my father took out the memory and put them back in.. problem still persists.

And the monitor doesn't say anything for me that would help..

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  • randomranma Feb 09, 2009

    We can't find the culprit..the computer hasn't worked normally yet.



    but we have gotten 1 and 2 flashing lights now.

  • randomranma Feb 09, 2009

    Wow. Okay I found the problem..

    just wow.

    I had some things lying on top of my keyboard that prevented it from starting up. Just wow.



    Thanks anyway~

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Disconnect all the drives connected like hard disk , cd drives or dvd drives and floppy drive and than start the system and if i am not mistaken it should start ... than shut the system again and than connect the drives one and start the system and if that works connect the other drive one by one and u will find the culprit and if the system is under warrantty contact dell on 18006249896

Posted on Feb 09, 2009

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Invoking Beep Codes

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If the computer is actually functioning and the computer beeps continuously, then there is a problem with a voltage on the power supply being incorrect or the CPU overheating. IMMEDIATELY go into the BIOS and check CPU temperature, fan speed and voltages

**********************************************
BIOS Beep Codes

Annoying isn't it? You have built your computer you switch it on and then nothing happens except a few beeps from the PC speaker. Frustration sets in as you try to figure out what is wrong with it. If you didn't already know the computer has already told you the problem. It can't speak of course but it can direct you to the problem. Its all in the beeps. The BIOS can recognise when the problem occurs and sends a signal out to send a certain amount of beeps through the speaker. These beeps then tell you the location of the problem.

Unfortunately not all the BIOS' use the same codes as each other. Two of the main BIOS manufactures AMI and Award (now Phoenix) have different codes for there errors.

AMI BIOS

# of Beeps Error Description
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2 Parity Error Parity error in the Base (1st 64K) of memory
3 64K Base Memory Error Memory error in the base memory (1st 64K)
4 Timer Not Operational Timer 1 is not functioning (also caused by error in base memory)
5 Processor Error CPU error
6 8042 Gate A20 Failure Unable to switch to protected mode
7 Processor Exception Interrupt error The CPU on the CPU card generated an interrupt error
8 Display Memory Read/Write Error Video adapter is missing, incorrectly seated or has faulty memory
9 ROM checksum error The ROM checksum does not match that of the BIOS
10 Coms Shutdown Register Read/Write The shutdown register for coms RAM has failed
11 Cache Memory Bad The cache memory test has failed. Cache memory will be disabled. *** DO NOT enable it ***


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Award BIOS

Award states that they now only use one beep from there BIOS. This beep is one long beep and then two short beeps. This indicates a graphics card problem. Any other beeps should be treated as a RAM problem first and then the board sent in to be inspected.

The reason that the Award BIOS only uses the beep code for display problems is that it tries to display the error on-screen if at all possible. If the BIOS cannot initiate the display adapter then this causes the BIOS to make the beep code for a display error, which must be corrected before any other errors can be determined. Memory Test fails and hard disk failures etc will all be displayed on screen

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The IBM BIOS works with Short and Long beeps as well as the Award BIOS. However the IBM one does still have codes to work from.

Beep Code Error
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2 Short Beeps POST Error - Code on Display
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Continuous Beep Power supply or Motherboard error
Repeating short beeps Power supply or Motherboard error
1 short, 1 long beep System board error
1 long, 2 short beeps Display adapter error (MDA/CGA)
1 long, 3 short beeps Display adapter error (EGA/VGA)
3 long beeps 3270 keyboard card
Phoenix BIOS
The Phoenix BIOS works on a slightly more complicated manor than the others. It does display an error code for you and produce a series of beeps. This BIOS produces its beeps according to the hexadecimal code the error produces. The Phoenix BIOS has many different codes for its possible errors and so many different beep codes. Rather than list the entire section here, I have provided a link to the official PDF file containing the codes and how they are derived.

Phoenix BIOS Post Codes

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pls try to use another compatible memory stick.

then confirm the status of your micro processor

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