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Windows 7: Pc is very slow and unusable after electricity failure.

30 Jul 2014   #1

Win7 64bit Ultimate
Pc is very slow and unusable after electricity failure.


yesterday there was an electricity failure in my house, which include the first failure and than the electricity company tried to bring back power but it fail after 2 second .

after power came back to regular , my pc started up but became very very slow .
every click on the mouse take a long time to respond and sometimes causing the apps to freeze.

system restore to earlier point fail and chkdsk isnt working - something about other program using the c: drive.

i dont know if its a windows failure that formatting will fix or hardware failure (hdd, MotherBoard, CPU).

any suggestion ?


My System SpecsSystem Spec
30 Jul 2014   #2


To find this out I would boot a boot CD of any kind to see if it functions correctly. Then you'll know its either your hard drive or the OS itself that needs replacement or repair/reinstall.

If you boot into a Boot CD like Hirens of UBCD you can test your hard drive, RAM and rescue your files. All of this activity will demonstrate if the boot CD functions normally which would indicate the mobo is still good. If so then it after testing your hardware from the boot CD if it proves OK I would move to the Troubleshooting Steps for Windows 7.

If you'll report back as you go there may be other repairs indicated.
My System SpecsSystem Spec
30 Jul 2014   #3

Windows 10 64 bit

With a power failure, while the PC is powered on and running can be anything. Corrupted hard drive, hardware failures (including power supply), BIOS corruption - Anything.

First thing, reset the CMOS Memory (BIOS) and see what happens. On power on, do you get any errors or beeps? The PC does a POST (Power On Self Test) to check hardware, although this is just a cursory quick check, not a full hardware diagnostic.

The problem could also be memory (hardware) with the very slow response. With a 64 bit OS and only 4GB of RAM (64 bit OS uses more memory than a 32 bit OS and the real reason for having a 64 bit OS is that you have more than 4GB of RAM). Take one of the memory sticks out and see if it makes a difference. Also try running in Safe Mode and see if it works any better.

There are hardware diagnostics available but you would need to download them on a different computer and create a bootable CD (for example for memtest86).
My System SpecsSystem Spec

30 Jul 2014   #4

Win7 64bit Ultimate

thank you for you both.

i will tried to use a boot cd
My System SpecsSystem Spec
02 Aug 2014   #5

Win7 64bit Ultimate

i run hd seintinel and got a lot of errors- and 13% health for my hdd.
i could figure how to fix it , so before going and buy a new hdd , i decided to isntall windows 8.1 .
after doing that i still getting the result in the picture above (the picture represent situtation after installing windows 8.1)
BUT all the slowing issue were gone and pc work as fast as before.

question is , knowing that although hdd is 13% health , should i buy a new one to avoid situation that in 2-3 month from now , i will have a hdd failure again, maybe one that data could even be restore ?

what do you think ?
My System SpecsSystem Spec
02 Aug 2014   #6


It shows you have 3 hard drives. Which is the Win7 drive. If its the WD then test it using WD Data Lifeguard from boot disk.

Any of those other drives could be slowing down Win7 so unplug all others to confirm each ones condition then with only the Win7 drive plugged in work through repairs in the Failure to Start tutorial below.
My System SpecsSystem Spec

 Pc is very slow and unusable after electricity failure.

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