Here some common PC errors and the solutions for them...

Do have a look...................!!
1. MONITOR LED IS BLINKING
Check all the connections like Monitor Cable, Data
cables,RAM, Display Card , CPU connections.
2. CONTINUOS THREE BEEPS
Problem in RAM Connection.
3. THREE BEEPS ( 1 Long 2 Short)
Problem in Display Card Connection
4. THREE LONG BEEPS PERIOD WISE
Problem in BIOS or RAM (Basic Input Output System)
5. CONTINUOS NON-STOP BEEPING
Key Board Problem (I.e.; Some Key is pressed for
Longer time)
6. FDD LED IS GLOWING CONTINUOSLY
Data cable to be connected properly (twisted cable).
7. NO DISPLAY ON THE SCREEN AT ALL
Hard Disk cable connected wrongly. Connect rightly
seeing the Red mark (Faces power supply) and then
Restart.
8. POWER LED IS OFF
a. Check main power cord
b. Check S.M.P.S.
c. Check Mother Board connection
9. SHOWING CMOS ERROR
Replace 3 Volt battery of Mother Board . Set Original
Settings Manually.(Refer CMOS Setup chart)
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10. SHOWING FDD ERROR OR FLOPPY DRIVE IS NOT
WORKING PROPERLY
Check Power cord of FDD , Data Cables , set CMOS &
Finally the Check drive.
11. SHOWING HDD ERROR OR HARD DISK FAILURE
a. Check Power Cord
b. Check connection of HDD
c. Check Data cable
d. Check Hard Disk parameters in CMOS or Auto
detecting Setting Partitions by Fdisk Command, then
format it to set track 0.
12. MOTHER BOARD HANGS DUE TO UNSTABILIZED
POWER SUPPLY
a. Check S.M.P.S
b. RAM not functioning properly.
c. Software problem (due to using pirated software)
d. CPU fan not functioning properly.
13. DANCING SCREEN
a. Check Display card connection
b. Virus Problem
c. Video Memory Problem
14. SHAKING SCREEN
a. Earthing problem
b. Magnetic waves comes around.
15. CPU CABINET SHOCK
a. Check Earthing
b. Check main power cord.
16. NON-SYSTEM DISK ERROR
a. Floppy Drive having different disk (Non-Bootable
Disk) OR CMOS Parameters for Hard Disk may not be
set properly.
b. Hard Disk Partitions may not be created.
c. Hard Disk may not be formatted.
17. MISSING OPERATING SYSTEM
The System files missing namely Ie; command.com} -
User File IO.SYS & MS_DOS.SYS } - Hidden Files. These
above three files required for Start up of the system
that can be transferred by using SYS C: Command OR
While the time of formatting by using Format c:/u/s
18. MISSING COMMAND INTERPRETOR
May the file Command.com is corrupted OR Infected
by Virus OR Some one has Erased it.
19. SHOWING I/O ERROR
a. The type of Hard Disk in CMOS may not be set
properly.
b. Operating system used for formatting is not valid
20. SHOWING DIVIDE OVER- FLOW MESSAGE
a. May some Directories or Files crash with other files.
b. Use CHKDSK/F or SCANDISK Command to correct it.
21. HARD DISK MAKING NOISE WHILE PROCESSING
a. Unstabilized power supply.
b. Check for Loose Contact.
c. Do not use Y Connectors for Hard Disk.
d. It may create Bad Sector OR Weak Hard Disk.
22. HARD DISK HANGS WHILE PROCESSING
Check for Bad Sector by using CHKDSK or SCANDISK
Command. If found format the Hard Disk and set
Partition before that area.(This is the only procedure
to use Hard Disk with Bad Sector) OR (To avoid Bad
Sectors use Standard Power Supply)
23. HARD DISK NOT DETECTED
a. Check Power Connector
b. Check Data Cables
c. Check Jumpers
24. PARTITION NOT SHOWN
Operating System where the Hard Disk formatted is
not supported with present Mother Board. For Eg:
Hard Disk formatted with Pentium System will hide
their partitions for 486 System.
25. MMX/DLL FILE MISSING
May the above files may be corrupted due to power
failure or Virus. Make available above files from other
Computer. OR Reinstall Windows 98 Operating
System. (This procedure will not make any effect on
existing Data).
26. WINDOWS REGISTRY ERROR
This will happen due to sudden ON/OFF of the
system. Final solution is to Reinstall Operating System.
27. DISPLAY COLOUR DOES NOT MATCH
a. Configure Display Card properly with their CD.
b. The Standard setting for Windows is set it to
800x600 for better performance.
28. UNKNOWN DEVICE FOUND
May the Driver utility is not provided with operating
system . Insert Driver CD and install software for the
above Device...