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.
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.
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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
<p>It has been one of the dilemma of computer users is to identify what is really
causing the failure in their computer. Often they think that they bought a
defective product since they are getting these kind of errors in the computer.
Having an error on your machine does not mean that the machine is defective or
needs parts replacement. for all we know it might just need some simple
troubleshooting steps to fix the issue. Here is a tip where you would be able
to know if you need to bring your computer to a service shop for parts
replacement or you can try to fix it at home by doing some troubleshooting
steps that would help fix software failure in the computer system.<br />
On a Windows based operating system, you should always know when the issue
happens. It will help much to observe your computer on how it boots up and what
it does before you get to the desktop screen. Take a note on where and when
exactly the error occurs.<br />
Power Failure:</b><br />
This is an issue where there are no lights on the power button of your
computer, whether it is a portable system or a desktop computer. Obviously this
is a hardware failure. surprisingly, discharging the flea power of your
computer sometimes resolves these kinds of issues. Otherwise, you will
definitely need to have a local technician look at your system for parts
Note:</b> flea power is the charged power of our computer system. A computer system
is made up of electronic components such as capacitors which hold electronic
charges. To be able to discharge it, you should disconnect all power source
from your computer and hold the power button for at least 5 seconds.<br />
POST Failure:</b><br />
POST is an abbreviation for Power On Self Test. as the name implies, it is the
test that a system goes through to test the basic hardware components needed
for a computer to boot. The components that it tests are as follows: Processor,
BIOS (Motherboard), Memory, keyboard and video card. If there is a POST
failure, the system would give you a black screen with lights on the front
panel. Sometimes it will give you beeping sounds which would normally mean that
you have a memory failure on your system. If you encounter such issue, you will
need hardware technical support to guide you isolate further on what could be
causing the failure.<br />
Boot Failure:</b><br />
Boot failure is when the computer is able to complete post. You will be able to
know this if you hear a single beep on your computer. Isolating a boot failure
from a post failure simply requires you to boot to the System
Setup/configuration Screen (BIOS). If you are able to get to the BIOS, that
means all the POST hardware component are good to go. However, booting to the BIOS
differs per system. You just need to do trial and error on the following keys
to tap as you turn your computer on.<br />
To isolate an issue whether it is a software or a hardware issue, you just need
to boot from the BIOS. If you are able to boot from the BIOS, chances are it is
not a hardware failure and needs servicing.<br />
<p><img src="vincent_von_0.jpg" /><br />
If booting to the BIOS works, to further isolate the issue whether it is the
advanced software, you need to boot to Safe mode. Safe mode is a
troubleshooting state where only the basic applications and drivers are active.
If you are having errors or boot failure, try to boot to Safe Mode. If you do
not encounter the failure in Safe Mode, that means that there are advanced
software being loaded in your operating system that fails. It is just a matter
of knowing what that software is.<br />
Booting to Safe Mode:</b><br />
1. turn computer on and tap on F8 before Windows starts.<br />
2. You will be getting the Advanced Boot options. Use the arrow keys to get to
the option for Safe Mode.<br />
<p><img src="vincent_von_0.png" /><br />
Safe Mode Definitions:</b><br />
Safe Mode: Just basic software are being loaded. Network drivers are not
included which means no internet connection<br />
Safe Mode with Networking: Basic software and Network drivers are being loaded.<br />
note: for Vista or Windows 7, it includes wireless network drivers. This means
that you can still connect to the internet with a wireless connection. In
Windows XP, the wireless driver is not included even if you boot to Safe Mode
with Networking<br />
Safe Mode with Command prompt: this is a troubleshooting state where you will
be able to utilize DOS based commands.
restart your computer repeatedly tapping the f8
key to enter safe mode while the screen is black once in safe mode where the
only things working will be your keyboard and mouse allowing you to attempt to
repair your computer you could select the option start at last known
configuration that worked this will tell you if and what file has been
corrupted or missing then you will know if its a hardware issue then select
restart if the problem still persists f8 back into safe mode you might need to
select your operating system to load into safe mode click start control panel
administration tools computer management in the left panel events + to expand
then system you will see all errors in right panel right click select
properties this will tell you what has occurred and the time it occurred you
might use the system restore to restore your system to an earlier time click
start all programs accessories system tools you should see your system restore
optionif it is a hardware
issue the system restore might not work if it is
the beeps are post during
post the very first work is done by the ram,all the memory in the ram is first
transferred to the hard disk,and remains active untill turned off. make sure
that your RAM and Cmos battery are securely seated One bad lead can cause a computer to continue on a cycle or
to shutdown or fail to detect your hard drive 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 they could be faulty a computer needs its connections to continue its cycle and
to have and end to function the beeps are
post pre operating system searching for some hardware it could be RAM cd/dvd
hard drive or motherboard all of these must have secure connections for the
computer to work make
sure all leads that are attached to your drives dvd\cd 3 1/2 inch floppy have
secure make sure the connections and are not faulty even the electrical
extensions or just replace them they could be faulty a computer needs all
electric current and computer data to travel to and through every working
device and have an end to work properly click start right click on my computer
so any faulty leads will end up with a computer error if you need more help with this post a reply hope this helps you
try uninstalling a few unnecessary programs then click start run type cmd then type chkdsk/r/f this should schedule to happen on reboot which will scan for and attempt to recover bad sectors and automatically fix any corrupt files on your hard drive or click startcontrol panel administrive tools,computer management ,disk management right click on your drive select properties click tools you should see click check now click start two boxes automatically fix files and scan for and attempt recovery of bad sectors place then a tick in both boxes then select check now,start should schedule this task when restart do not do anything while the chkdsk utility is in progress any input may damage your computer then you should test or replace all leads make sure they are securely seated and are not bad/faulty that are attached to your(((motherboard to your hard drive))) do not do anything while the chkdsk utility is in progress any input may damage your computer then click start all programs accessories system tools defragment your hard drive you might have to install more RAM random access memory to check how much ram you have click start right click on my computer select properties you will see all imformation about your computer including installed ram scroll to the bottom toolbar (bottom of screen) right click you can select task manager applications also processes you will see whats running on your computer you might have virus slowing your computer also select users you will see who is using your computer hope this helps don
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)) 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
If you receive the Blue Screen, that means the Laptop is having a trouble with
Operating System/ Sub System failure
Software Device/Application Failure
You have to include the BSOD message. Please do it next time so that I can give a more appropriate answer.
If the blue screen doesn't remain, here is what you have to do to Disable the Automatic Restarting.
When the system boots you have to go to the Operating System Menu.
Most PCs and LAPs has the Default key "F8" or "F11". Check the keys and hit until you are directed to an Operating System Choice menu.
Select "Disable Automatic Restart on a System Failure" and Hit Enter.
Blue Screens are usually caused by three factors, the first and easiest to detect is a faulty ram, the second and a little more complex failure surface is hard and the third and most complex operating system failures , in the latter you must use the restore disk that came with your computer and reinstall the operating system, only to lose all data on the hdd
If the POST screen is coming up, showing the the correct amount of memory in the system, and then telling your hard disk failure or something similar, your hard drive has failed. Put a new hard drive in the system, reload your operating system and all drivers, and attempt to use the old hard drive as a second drive long enough to get any files you need from it.
Plz Check and change or Replace 1)RAM 2)Monitor's VGA cable 3)Any other Cards such as (Graphic,Modem etc)
Because some time Ram's cant work and system still black screen when start the system. If RAM is Good working plz check monitor's cable the 3rd option is replace/remove the Cards some times any hardware device failure complete computer system is Down If Problem is still there Go to Computer sales and Service Center DON'T APPLY OTHER EXPERTISE!