No signal at the monitor indicates (if you know the monitor is working ok) a failure of the graphics chip or graphics card, The lack of indicator light on the num lock LED and the lack of power to the mouse would indicate that there is a major issue with the motherboard.
you can try using another monitor to confirm the problem lies with the graphics, and in the case of the keyboard and mouse, swap them for a usb version, if they work, the Ps2 ports are probably damaged.
I'd be thinking of replacing the motherboard
SOURCE: Mouse and Keyboard not recognized
First make sure that you have your keyboard and mouse in the right ports. After boot your computer in safe mode and check them. To enter safe mode press f8 once you turn your computer on
SOURCE: Added a memory stick to my Dell 2400 Desktop computer and the monitor, mouse, & keyboard won't work
Hi
The supported Memory types for Dimension 2400 Series is PC2100 (266-MHz) or PC2700 (333-MHz) DDR SDRAM (non-ECC). Supported Memory capacities are 128, 256, or 512MB and a Max if 1GB (1024MB).
The first obvious question is does the new 512MB Memory module meet the above specification? Some Memory modules are able to steep down speed.
If it does, then first ensure the new memory module is properly installed. Take ESD (ElectroStatic Discharge) precautions or you may damage the new memory module and/or the system board.
To proceed compare the system beeps and diagnostics lights color and sequence to the Advanced Troubleshooting guide.
It is possible that the new memory is DOA (Dead On Arrival). Or there is a new fault on the system. If you have access to another compatible system, you may test the new and old memory modules. You may also swap the new and old memory modules to determine if the memory slot is at fault.
Lastly, if you remove the new memory module, does the system complete POST (Power On Self Test)?. If it does you may indeed have a DOA or incompatible part.
Mike
SOURCE: motherboard drivers for hcl ezeebee top 4991 c2d
chk this link and try is it compatiable with ur laptop
http://rapidlibrary.com/index.php?q=hcl+ezeebee+notebook+l7910+sound+driver
SOURCE: I have installed window 7,but sound driver not
Hi,
Just go on the flowing link for download the HCL Desktop driver
And install.
HCL Driver site
http://203.76.139.132:8080/examples/jsp/download/pon_index.jsp
Thanks
Abhay Singh
SOURCE: IBM ThinkCentre S51 Intel Pentium 4 PC Desktop
Sounds like it's probably the power supply. The computer takes more power to boot up than to run, so if it can't get enough wattage it can't boot all the way up, and it will shut down and try again.
If you're comfortable opening your computer up, you can test the power supply connectors with a voltmeter or multimeter to verify. A new power supply is typically only $30 or $40.
Testimonial: "Thanks a million! I suspected it was something related, but having just purchased the computer from Tiger Direct, I was under the impression that all equipment was properly tested and verified to be in working condition. I will simply return and have them ship out another. Thanks again! DC"
When
you plug in the power cord is there any lights whatsoever on the laptop, where
the plug goes in or on the AC Adapter of the power cord?
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 computer 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
laptop 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 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.
Shine a flashlight on the dark screen to see if you barely
see the icons on the desktop. If so, then the LCD Inverter is bad.
Plug in an external monitor and see if the display shows up on it. It can be
any kind of monitor even the old big fat crt monitors as long as it has a vga
cable to connect to your computer's vga port. If so that proves your
video card is ok. The video will show on most systems when you reboot
without you having to do anything. Some systems will require you to hit the FN
(Function key) + F1 thru F12. Hold down the FN key then hit the correct
key for displaying on the monitor (F1 thru F12). The correct key will
normally have CRT/LCD on it or it will have the icon of a display.
If you see no icons by shinning a flash light and the external monitor works,
then your screen is bad. If you see no icons by shinning the flash light
and nothing shows on the external monitor, then most likely your video card is
bad.
If you don't think the system booted all the way then try the steps below.
Beep tones and blinking lights tells the
technicians what is going on with the laptop 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 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.
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