Computer Repair Galway

A word of caution: Static electricity can kill the circuitry inside your computer. Before you reach for anything inside that box, ground yourself by touching the metal computer frame.

Galway Computer Repair
No matter how well built your PC is and how well written its software, problems can occur. Diagnostic software can help troubleshoot problems when your computer malfunctions or you are in the process of upgrading a system component, or especially when you are building an entirely new system from scratch. This chapter examines several types of diagnostic software, including the built-in POST (power-on self test) as well as commercial and open-source diagnostic software.

You also might find that your system problems are caused by a hardware malfunction and that you must open the computer case to perform repairs, if you dont think you can do it yourself give computer repair galway a call. This chapter examines the tools and testers used to and repair PCs-both the basic items every user should own and some of the more advanced devices.

Of course, the best way to deal with a problem is to prevent it from occurring in the first place. The preventive maintenance sections of this chapter describe the procedures you should perform on a regular basis to keep your system in good working order galway computer repair.

BIOS POST Beep Codes (From Computer Repair Galway
Beep codes are used for fatal errors only, which are errors that occur so early in the process that the video card and other devices are not yet functional. Because no display is available, these codes take the form of a series of beeps that identify the faulty component. When your computer is functioning normally, you should hear one short beep when the system starts up at the completion of the POST, although some systems (such as Compaq's) beep twice at the end of a normal POST. If a problem is detected, a different number of beeps sound, sometimes in a combination of short and long tones.

Some implementations of UEFI firmware also use POST codes to report errors pc repair galway.
BIOS POST Checkpoint Codes

POST checkpoint codes are hexadecimal numeric codes written by POST routines to I/O port address 80h as each major step is begun. These are often simply called POST codes. These POST codes can only be read by a special adapter card plugged into one of the system slots. These cards originally were designed for system manufacturers to use for burn-in testing of the motherboard. Several companies make these cards available to technicians. Micro 2000, JDR Microdevices, eSupport, Ultra-X, and Trinitech (search for Omni Analyzer) are just a few manufacturers that market these POST cards.

Computer Repair Galway
POST checkpoint codes can track the system's progress through the boot process from power-on right up to the point at which the bootstrap loader runs (when the operating system load begins). When you plug a POST code reader card into a slot, during the POST you see two-digit hexadecimal numbers flash on the card's display. If the system stops unexpectedly or hangs, you can identify the test that was in progress during the hang from the two-digit code. This step usually helps to identify the malfunctioning component.

Originally, most POST reader cards plugged into the 8-bit connector that is a part of the ISA or Enhanced Industry Standard Architecture (EISA) bus. Some older PCI-based systems do still have ISA connectors that can use these cards. However, the motherboards found in modern PCs have no ISA slots, so obviously an ISA POST card won't work computer repair galway. Fortunately, the companies that make POST cards more often than not make PCI versions. Micro 2000 has a card called the Post-Probe, which has both ISA and PCI connectors on the same board. PC Diag Inc. has a similar card called the PCISA FlipPOST PC Repair Galway