Solved Mbr corrupt and i/o device not found.

[Cratoxylum]

Hai!
Guys iam having a problem with my assus n55sf. I try to clean my asus every weekend (clean, scan disk & defrg) and shut down. When i try to on it show me windows 7 repair (recom). I dont know whats wrong. I start repair my asus and the result (mbr corrupt) i try fix mbr it show me (i/o device not found) i go to bios and check my hard disk its there..
Please guys help me...

 

[Kaktussoft]

boot into windows recovery environment "repair your computer" and select command prompt.

diskpart
list vol
sel disk 0
list part
exit

All partitions are still there?
you saw volumes and drive letters. Ignore the dvd drive letters. Assume you have C,D,E (and F dvd)

chkdsk/f c:
chkdsk/f d:
chkdsk/f e:

no errors? if errors... run it again. All errors gone and repaired?

bootrec/fixmbr
bootrec/fixboot

Both command succesfully?

 

[gregrocker]

Why are you runnning Scandisk as part of regular maintenance? That's ridiculous. Win7 doesn't need that much cleaning and defragging anyway. Just monthly at the most run CCleaner and Puran Defragger's boot-time defrag. Periodically add Disk Check option to the defrag.

Boot the Win7 installer System Recovery Options or System Repair Disk to run Startup Repair - Run 3 Separate Times.

If this fails work through these steps for Troubleshooting Windows 7 Failure to Boot