Member Avatar for mayank.dyl

I was working on computer and a blue screen appeared which lasted for a long time so i just turned off the computer. And now things connected from back of the CPU like Monitor, Keyboard and mouse are not working or not getting any input from CPU.
What is the issue and possible solution ?

Thanks a ton.

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Brief summary of the situation and where to focus: the machine experienced a blue-screen and was powered off hard. After that the monitor shows no signal (goes to sleep) and the keyboard/mouse LEDs stay off, although the PSU/fans appear to spin; a bootloader error was observed once. raised PSU as a suspect, focused on keyboard/BIOS checks, and mentioned OS reinstall as a last resort. The following is a compact, practical isolation and repair sequence (hardware first, bootloader/drive second).

First, rule out simple hardware causes and POST failure: confirm fans, HDD spin, and any motherboard LEDs or POST beeps (attach a system speaker if none present). Try a known-good keyboard and mouse on the rear ports (and on a different PC). If available, test a PS/2 keyboard or different USB ports. Clear CMOS (remove the coin battery for 60 seconds or use the jumper) and reseat RAM (test one stick at a time in each slot), the GPU (or switch to onboard video), and all power connectors (24-pin + 4/8-pin CPU). Remove all nonessential devices (DVD, extra HDDs, USB peripherals) and attempt a minimal boot to reach BIOS. Visual inspection for bulging caps or burn marks is worthwhile.

If the BIOS sees the hard drive, attempt boot-repair from Windows media (Startup Repair or Command Prompt). From the recovery prompt, these commands repair MBR/boot records and check the filesystem:

bootrec /fixmbr
bootrec /fixboot
bootrec /scanos
bootrec /rebuildbcd
chkdsk C: /f /r

If the HDD is not visible or USB ports never power, verify PSU voltages with a multimeter or swap in a known-good PSU (5V USB rail and 12V rails matter). If the motherboard fails to initialise USB or POST after the minimal checks, a motherboard fault becomes likely; replacing it may require OS reactivation or a fresh OS repair. Before any board swap or OS reinstall, image or copy data off the drive (connect the disk to another PC or boot a live USB) to preserve files. ESD precautions and correct motherboard-CPU/memory compatibility are important when replacing parts.

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Member Avatar for BigPaw

Could you tell us what sort of computer you have, including make and model, as well as how old it is, please?

Do you remember anything that was said on the bluescreen? Sometimes it can give us a clue to the fault. Also, when a computer "bluescreen's" or BSOD, (blue screen of death) the only thing you can do is to use the power button to turn it off.

Member Avatar for JorgeM

When you power up the computer, do you see any lights on the keyboard light up, such as the num lock? If you have no lights, during the POST are you able to use hte keyboard to get into the BIOS CMOS Setup, just to verify if the keyboard is working outside of Windows.

Edited by JorgeM
Member Avatar for BigPaw

And now things connected from back of the CPU like Monitor, Keyboard and mouse are not working or not getting any input from CPU.

He's already answered that...

Could you tell us what sort of computer you have, including make and model, as well as how old it is, please?

Do you remember anything that was said on the bluescreen? Sometimes it can give us a clue to the fault. Also, when a computer "bluescreen's" or BSOD, (blue screen of death) the only thing you can do is to use the power button to turn it off.

Member Avatar for mayank.dyl

..i am using HP p6040in desktop computer baught in 2009 and hence almost 3.5 yr old.
The configuration are : Core2duo processor, 3 GB RAM, 500 GB HDD, DVD writer, 18.5 inches monitor, nVidia MOBO with inbuilt nVidia 7100 graphic card(128 MB).
Didn't notice the message on blue screen but it stayed for long so i had to turn off CPU.

...when i turn on the CPU now, the keyboard doesnt show any light on any of the locks plus no red light on mouse also. Only monitor turns on and shows message that "Monitor going to sleep" as the power supply of monitor is seperate, i think it goes to sleep as it does not receive any input from CPU.

What i think is this that MOBO is not working. What you guys say ?

Member Avatar for BigPaw

Does the PSU (power supply unit) do anything? If not then potentially that could be the cause of this fault. Because of the overall age of the PC you may want to go for a complete upgrade?

If not a full upgrade then you may want to try replacing the PSU first if that does not start up. This may be the most cost effective and time efficient option. If you replace the motherboard then you will need to reinstall the operating system, drivers, and choice of software. And, you will need a motherboard that is compatible with your current hardware, such as HDD, (some motherboards are now SATA only) and memory, unless you don't mind upgrading these too.

If you do replace the PSU and find that the problem is with the motherboard then you have a spare PSU, which is never a bad thing.

These are only a few options for you. It's your call. :)

Member Avatar for mayank.dyl

PSU is working fine. When i tried to open BIOS as it showed some display once then a message came, which was "Bootmgr is corrupt. System can not boot."
Now what does this mean, any idea ?

Edited by mayank.dyl
Member Avatar for fobos

You might have to re-install your OS. What were you "working on" when this happened?
Heres a link if you get your keyboard working. Click Here

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