TROUBLESHOOTING

1. DEAD SYSTEM

Problem: -      Computer is not getting ON, No LED status and S.M.P.S. fan not moving.

Solution: -       1) Check Mains input. If not O.K. then first rectified it.

                        2) Check Power Cord. If faulty then replace it.

                        3) Check S.M.P.S. If faulty get it repair or replace.

                        4) Check loose connection. If loose connection then tight it.

2. NO DISPLAY

            Problem: -      Nothing coming on screen, Monitor, CMOS Battery, Display Card (VGA),

                                    RAM, RAM SLOTS, ROM.

Solution: -       1) Check L.E.D. of Keyboard. If getting On/Off while pressing Num Lock, Scroll Lock or Caps Lock then problem with monitor or display card is loose in slot. If does not giving any status then check the CMOS Battery, if battery is weak then replace with good one. If still there is no status then check loose connections of power connector and loose display cable from monitor to computer. If there is no beep then problem with MB, RAM, ROM, CPU. Replace one item at a time. If there is beep then diagnose according to the beep code. (It will give the beep statues for RAM, Display Card and also in some case for shorting or cache memory on motherboard.)

                        2) Clean the CPU sockets and slots in which the cards are installed and also RAM slots.

                        3) Check the display in min. requirement. If there is no display, then take out the MB, CPU, RAM and Display card from cabinet and assemble it outside and then check display if still there is no display then check the heating components. If any component is excessively heating then possibility of shorting of component then get it rectified.

3) SYSTEM NOT BOOTING

            Problem: -      1. Check whether any message coming on screen or it is not booting at all.

a)      Message Coming “Insert System Disk in Drive A”.

b)     Message Coming “Boot Disk Failure”.

c)      Message Coming “Bad Command Interpreter”.

d)     Message Coming “Missing Operating System”.

2. Nothing coming on screen only CURSOR is bliking.

Solution: -       a) If “Insert System Disk in Drive A” message is coming on screen it means System is not detecting any bootable device other than Drive A. First Check from CMOS setup that your HDD or CD-ROM is detecting or not, if detecting then check that booting files present on HDD or CD is Bootable. If booting files present on HDD then check for virus on HDD. Then check media of HDD by running SCANDISK then replace CD with another known good bootable CD. If still problem exist then boot from floppy, if system boots then problem with HDD logic Card if system doesn’t boot from Floppy that means problem in your motherboard.

                        b) If message displaying “Boot Disk Failure” then it means booting files on media is corrupt, Damage by virus or missing from booting media. Copy System Files with the help of SYS command or remove virus or format the media and transfer system files to media. Or may HDD Cable (Data Cable) & Power Cable may be loose.

                        c) If message is coming “Bad Command Interpreter” then it means Command.com files is missing or corrupt. Replace Command.Com with another good file of same version or check virus. If virus in system then remove it with the help of latest Anti Virus Software.

d) If message is displaying “Missing Operating System” then check the type of HDD according to CMOS setup.

2. If nothing coming on screen then check that system files missing or not. If system files are missing or corrupt then copy again.

4) SYSTEM BOOTING BUT NO DISPLAY

            Problem: -      Problem related to Monitor.

Solution: -       If system accepts anything from keyboard and some sound is coming from HDD or FDD and if Printer is connected to computer and it initialize then it means that system is working fine check for “Brightness Control or Contrast Control of Monitor, if O.K. then check signal cable of Monitor for disconnect or bend, if O.K. then change the display cable of M.B. If problem exist then problem with monitor, first check by replacing with another good monitor or check monitor Circuitry.

5) PRINTER IS NOT INSTALLING

Problem: -      Printer Problem, Driver CD Problem, Drivers not supported by the H/W and O/S, Driver mismatch or Connection Problem.

Solution: -       1. Check whether printer is connecting to computer. Start computer in DOS and take printout in DOS by giving command DIR>ORN. If printout comes then everything is O.K. if message is displays “Write fault error writing device prn” then it means LPT1 port of Computer is faulty. If message “Printer ready error” then cit means either printer is switched off or it is off line. If message comes “Paper out error” then check that paper is inserted in printer.

                        2. If printer is working in DOS but not installing in windows then check for proper drivers, which are comfortable to our Operating System.

                        3. Check in CMOS Setup that printer port is not disabled, if disable then enable it.

                        4. Check in device manager there should not be any Yellow or Red mark in front of parallel port. If any mark is coming then it means IRQ7 is used by another device or printer port is disabled, Change IRQ of another device by going to properties of another device.