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Complete failure after modifying RAM

When I attempt to start up my computer, I see nothing on the screen. This includes the POST or operating system loading screen. The backlight doesn't switch on either.

I have tried to press F2 shortly after turning the computer on to see whether it is simply a display problem, but I do not hear the beep from the speakers associated with entering the BIOS.

However, when I insert a disc, I can hear it spinning in the drive and the computer attempting to read it. I am certain power is getting to the computer.

When the problem arose, I was upgrading the original 2GB RAM to 4 GB using two Kingston 2 GB DDR2 SODIMM modules. After I installed the new modules, the computer failed to start Windows (I did see the POST in this case, it simply frose on the OS loading screen). After several attempts at starting in safe mode (the computer restarted after loading the files), using startup repair (the same) and the memory diagnostics tool (simply frose at 0%), I removed the replacement RAM and replaced the original modules. The computer again functioned correctly.

I then attempted to insert one of the new modules with one of the original modules. This was successful, and my computer (BIOS and Windows) reported having 3GB of RAM installed. I ran several resource-intensive applications which varified that the extra gigabyte was actually being used.

The problem I described above arose when I next attempted to start my computer. The computer is an Acer Aspire 2920Z dual-booting Windows Vista SP1 and the Windows 7 beta, both 32-bit editions. When I talk about Windows above, I mean Vista. Whilst swapping the memory modules, I followed instructions on Kingston's website to the letter.

I'd really appreciate any assistance.

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If you know how to remove the cmos battery, I would suggest that you do so. Leave it out for 20 secs. Restore the battery (if possible use a battery tester to verify the charge in the battery). Restart the computer and press whatever key (delete, F2, Esc) to get into your setup to see what the system setup is reading. If you know how to change the settings for your changes then proceed.

Posted on Jan 21, 2009

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Could a dead bios battery result in a blank black screen?


The EEPROM is not the copy of the BIOS used to boot the OS or effect settings. The EEPROM defaults get copied into CMOS memory (hence why it is called the CMOS battery). So if the CMOS battery is dead then there is nothing to energize the CMOS chip to retain its values. That means on every boot you will get the defaults loaded from EEPROM. It will not cause black screen.
you do not give much info, does machine come on and runs but screen is black, or computer dose not start at all, more detail would help, press the helpful button and RE POST with more info

Jan 31, 2016 | PC Laptops

Tip

NO POST / Power General troubleshooting.


This document is intended to help users who are experiencing issues with POST and may have any of the below symptoms.

1. Computer beeps irregularly when the computer is turned on.
2. Computer turns on but does not boot.

Note: Not all computers have beep codes, some of the newer computers have LED's that light up that indicate the error or have a sound file to indicate the error.

A POST failure can be caused by any of the following situations.
1. New hardware conflicting with old hardware
2. Bad or failing hardware device.
3. Other hardware issue. (electrical shorts or incompatibilities.)

Warning: Some of the below steps recommend removing physical parts within the computer. While in the computer it is highly recommend that you be aware of electrostatic discharge and its potential hazards. ALWAYS ground yourself and your equipment. Ensure your computer is unplugged!

Note: Make sure your computer is turning on, if you press the power button and nothing happens (no lights, no sound, no fans, etc.) then this issue is not a NO POST but is an power related issue.

If any new hardware has been recently added to the computer, remove that hardware to make sure it is not the cause of your issue. If after removing the new hardware your computer works it's likely the computer is either not compatible with the new hardware or a system setting needs to be changed to work with the new hardware device.

1. Remove everything from the back of the computer except the power cable. Turn on the computer and see if it beeps normally. If the computer has never beeped also connect a monitor to the computer to see if any change occurs.

2. Check the stand-offs (the metal or plastic insulators) that keep your motherboard off and away from the case or housing. Ensure they are not grounding or shorting the motherboard out. If they are metal, ensure that the cardboard insulators are present. Ensure the motherboard is not grounding out to the case also at any other point.

3. If you are receiving a sequence of beeps consult your motherboard manual or the motherboard manufacturer's website for a listing of different beep codes and their explanation. These beep codes are meant as a method of quickly identifying what computer component is failing or bad.

4. Check to make sure power cables are not grounding or shorting to the case or other components. Ensure all ends are connected properly, securely, and snugly.

5. Make sure all fans are running in the computer. If a fan has failed (especially the heat sink fan for the CPU) your computer could be overheating and/or detecting the fan failure causing the computer not to boot.

6. If you were unable to determine by the beep code what is failing or do not have a beep code disconnect the IDE cables from the CD-ROM, Hard Drive, and Floppy drive from the Motherboard. If this resolves your post failure, attempt to connect each device one at a time to determine which device and or cable is causing the issue.

7. If the above recommendations still have not resolved the irregular POST, start disconnecting your expansion riser cards, these are the cards that are not essential to system operation. Break your motherboard down to the bare basics. Disconnect your floppy drive, CD/DVD ROM, and hard drives Your motherboard basics should have just the following: video card, RAM, motherboard and PSU (power supply unit). If this resolves the issue or allows the computer to post connect one card or device at a time until you determine which card or device is causing the issue.

8. If you continue to receive the same problem with all the above hardware removed attempt to disconnect the CPU and RAM from the Motherboard. Once done insert the CPU and RAM back into the computer to see doing this resolves your issue.

9. Ensure your PSU is of the correct size and power requirements for your system. Many newer motherboards and graphics cards are power intensive. Some newer graphics cards require their own separate power supplies. An underpowered PSU, will also cause system failure. Most new systems will not run well with less than 450W PSUs.

10. If after doing all of the above recommendations you continue to have the same issues unfortunately it is likely that you have bad or incompatible components, in particular RAM. Ensure your RAM is compatible with the motherboard. Many newer motherboards are very specific about what RAM sticks they will accept. Don't mix and match RAM speeds, type, or size.

11. If you have determined your components are compatible, then you have faulty hardware. The next step would be to test each component separately. You will need to find a working motherboard to test RAM with a diagnostic program like Memtest 86+. A faulty motherboard will need to be simply replaced. A bad PSU can only be replaced. Don't attempt to repair a bad or failing PSU. This is quite dangerous. High voltages and hazardous chemicals are present in PSU capacitors and other components – even when main power is disconnected. You can only replace a bad PSU.

12. If you keep getting the same failures after replacing CPUs, motherboards, and PSUs, there is a small chance that one of the peripheral cards is not compatible and causing damage or the card is conflicting with an internal integrated component. If you have integrated video or sound, you need to turn these off before using external cards.

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My acer laptop keeps rebooting giving me a blue error screen. Don't have disk that came with it what can i do?


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You have to include the BSOD message. Please do it next time so that I can give a more appropriate answer.
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Standard Original IBM POST Error Codes
Code Description
1 short beep System is OK
2 short beeps POST Error - error code shown on screen No beep Power supply or system board problem Continuous beep Power supply, system board, or keyboard problem Repeating short beeps Power supply or system board problem
1 long, 1 short beep System board problem
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IBM POST Diagnostic Code Descriptions
Code Description
100 - 199 System Board
200 - 299 Memory
300 - 399 Keyboard
400 - 499 Monochrome Display
500 - 599 Colour/Graphics Display
600 - 699 Floppy-disk drive and/or Adapter
700 - 799 Math Coprocessor
900 - 999 Parallel Printer Port
1000 - 1099 Alternate Printer Adapter
1100 - 1299 Asynchronous Communication Device, Adapter, or Port
1300 - 1399 Game Port
1400 - 1499 Colour/Graphics Printer
1500 - 1599 Synchronous Communication Device, Adapter, or Port
1700 - 1799 Hard Drive and/or Adapter
1800 - 1899 Expansion Unit (XT)
2000 - 2199 Bisynchronous Communication Adapter
2400 - 2599 EGA system-board Video (MCA)
3000 - 3199 LAN Adapter
4800 - 4999 Internal Modem
7000 - 7099 Phoenix BIOS Chips
7300 - 7399 3.5" Disk Drive
8900 - 8999 MIDI Adapter
11200 - 11299 SCSI Adapter
21000 - 21099 SCSI Fixed Disk and Controller
21500 - 21599 SCSI CD-ROM System
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Code Description
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3 Short Beeps Memory failure in the first 64 KB
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or Timer 1 on the motherboard is not functioning
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6 Short Beeps The keyboard controller may be bad. The BIOS cannot switch to protected mode
7 Short Beeps The CPU generated an exception interrupt
8 Short Beeps The system video adapter is either missing, or its memory is faulty
9 Short Beeps The ROM checksum value does not match the value encoded in the BIOS
10 Short Beeps The shutdown register for CMOS RAM failed
11 Short Beeps The external cache is faulty
1 Long, 3 Short Beeps Memory Problems
1 Long, 8 Short Beeps Video Card Problems
Phoenix BIOS Beep Codes
Note - Phoenix BIOS emits three sets of beeps, separated by a brief pause.
Code Description
1-1-3 CMOS read/write failure
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1-4-2 Parity failure first 64k RAM
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3-1-_ Faulty Motherboard
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3-4-1 Screen retrace test failure
3-4-2 Search for video ROM in progress
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4-3-4 Time of Day clock test failure
4-4-1 Serial port test or failure
4-4-2 Parallel port test or failure
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