Common Hardware Error And Solutions

1. MONITOR LED IS BLINKING 
Check all the connections like Monitor Cable, Data cables,RAM, Display Card , CPU connections. 

2. CONTINUOUS 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. CONTINUOUS NON-STOP BEEPING 
Key Board Problem (I.e.; Some Key is pressed for Longer time) 


6. HDD LED IS GLOWING CONTINUOUSLY 
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.

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Breif History of Computers

First mechanical computer or automatic computing engine concept

In 1822, Charles Babbage purposed and began developing the Difference Engine, considered to be the first automatic computing engine that was capable of computing several sets of numbers and making a hard copies of

the results. Unfortunately, because of funding he was never able to complete a full-scale functional version of this machine. However, in June of 1991 the London Science Museum completed the Difference Engine No 2 for the bicentennial year of Babbage's birth and later completed the printing mechanism in 2000.

Later in 1837 Charles Babbage proposed the first general mechanical computer, the Analytical Engine. The Analytical Engine contained an Arithmetic Logic Unit (ALU), basic flow control, and integrated memory and is the first general-purpose computer concept. Unfortunately because of funding issues this computer was also never built while Charles Babbage's was alive. However, in1910 Henry Babbage, Charles Babbage's youngest son was able to complete a portion of this machine and was able to perform basic calculations.

First programmable computer

The Z1 originally created by Germany's Konrad Zuse in his parents living room in1936 to 1938 is considered to be the first electro-mechanical binary programmable computer and really the first functional computer.

The first electric programmable computer

The Colossus was the first electric programmable computer developed by Tommy Flowers and first demonstrated in December 1943. The Colossus was created to help the British code breakers read encrypted German messages.

The first digital computer

Short for Atanasoff-Berry Computer, the ABC started being developed by Professor John Vincent Atanasoff and graduate student Cliff Berry in 1937 and continued to be developed until 1942 at the Iowa State College (now Iowa State University). The ABC was an electrical computer that used vacuum tubes for digital computation including binary math and Boolean logic and had no CPU. On October 19, 1973, the US Federal Judge Earl R. Larson signed his decision that the ENIAC patent by Eckert and Mauchly was invalid and named Atanasoff the inventor of the electronic digital computer.

The ENIAC was invented by J. Presper Eckert and John Mauchly at the University of Pennsylvania and began construction in 1943 and was not completed until1946. It occupied about 1,800 square feet and used about 18,000 vacuum tubes, weighing almost 50 tons. Although the Judge ruled that the ABC computer was the first digital computer, many still consider the ENIAC to be the first digital computer because it was fully functional.

The first stored program computer

The early British computer known as the EDSAC is considered to be the first stored program electronic computer. The computer performed its first calculation on May 6, 1949 and was the computer that ran the first graphical computer game.

The first computer company

The first computer company was the Electronic Controls Company and was founded in 1949 by J. Presper Eckert and John Mauchly, the same individuals who helped create the ENIAC computer. The company was later renamed to EMCC or Eckert-Mauchly Computer Corporation and released a series of mainframe computers under the UNIVAC name.

First stored program computer

First delivered to the United States Government in 1950, the UNIVAC 1101 or ERA 1101 is considered to be the first computer that was capable of storing and running a program from memory.

First commercial computer

In 1942, Konrad Zuse begin working on the Z4, which later became the first commercial computer after being sold to Eduard Stiefel a mathematician of the Swiss Federal Institute of Technology Zurich on July 12, 1950.

The first PC (IBM compatible) computer

On April 7, 1953 IBM publicly introduced the 701, its first electric computer and first mass produced computer. Later IBM introduced its first personal computer called the IBM PC in 1981. The computer was code named and still sometimes referred to as the Acorn and had a 8088 processor, 16 KB of memory, which was expandable to 256 and utilizing MS-DOS.

The first computer with RAM

 MIT introduces the Whirlwind machine on March 8, 1955, a revolutionary computer that was the first digital computer with magnetic core RAM and real-time graphics.

The first transistor computer

The TX-O (Transistorized Experimental computer) is the first transistorizedcomputer to be demonstrated at the Massachusetts Institute of Technology in1956.

The first minicomputer

In 1960, Digital Equipment Corporation released its first of many PDP computers the PDP-1.

The first mass-market PC

In 1968, Hewlett Packard began marketing the first mass-marketed PC, the HP 9100A.

The first workstation

Although never sold the first workstation is considered to be the Xerox Alto, introduced in 1974. The computer was revolutionary for its time and included a fully functional computer, display, and mouse. The computer operated like many computers today utilizing windows, menus and icons as an interface to its operating system.

The first microprocessor

Intel introduces the first microprocessor, the Intel 4004 on November 15, 1971.

The first personal computer

In 1975, Ed Roberts coined the term personal computer when he introduced the Altair 8800. Although the first personal computer is considered by many to be the Kenback-1, which was first introduced for $750 in 1971. The computer relied on a series of switches for inputting data and output data by turning on and off a series of lights.

The Micral is considered the be the first commercial non-assembly computer. The computer used the Intel 8008 processor and sold for $1,750 in 1973.

The first laptop or portable computer

The IBM 5100 is the first portable computer, which was released on September1975. The computer weighed 55 pounds and had a five inch CRT display, tape drive, 1.9MHz PALM processor, and 64KB of RAM. In the picture to the right, is an ad of the IBM 5100 taken from a November 1975 issue of Scientific America.

The first truly portable computer or laptop is considered to be the Osborne I, which was released on April 1981. The Osborne I was developed by Adam Osborne and weighed 24 pounds, had a 5-inch display, 64 KB of memory, two 5 1/4" floppy drives, and a modem.

The IBM PC Division (PCD) later released the IBM portable in 1984, it's first portable computer that weighed in at 30 pounds. Later in 1986, IBM PCD announced it's first laptop computer, the PC Convertible, weighing 12 pounds. Finally, in 1994, IBM introduced the IBM ThinkPad 775CD, the first notebook with an integrated CD-ROM.

The first Apple computer

Steve Wozniak designed the first Apple known as the Apple I computer in 1976.

The first PC clone

The Compaq Portable is considered to be the first PC clone and was release in March 1983 by Compaq. The Compaq Portable was 100% compatible with IBM computers and was capable of running any software developed for IBM computers.

The first multimedia computer

In 1992, Tandy Radio Shack becomes one of the first companies to release a computer based on the MPC standard with its introduction of the M2500 XL/2 and M4020 SX computers.

Other major computer company firsts

Below is a listing of some of the major computers companies first computers.

Compaq - In March 1983, Compaq released its first computer and the first 100% IBM compatible computer the "Compaq Portable."
Dell - In 1985, Dell introduced its first computer, the "Turbo PC."
Hewlett Packard - In 1966, Hewlett Packard released its first general computer, the "HP-2115."
NEC - In 1958, NEC builds its first computer the "NEAC 1101."
Toshiba - In 1954, Toshiba introduces its first computer, the "TAC" digital computer.

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