Hey there. With loads of complex devices all working together, bound by complicated intructions inside a PC, you're bound to have some trouble with some of the components sometime in your PC's life. Because of the complex nature of the computer, it can be frustrating to try and locate the troublesome component that's giving you grief. I'm here to help you with as many hardware problems as I possibly can. Whether your PC won't boot up, your graphics aren't working properly, you're hearing beeps during bootup or even if you're having networking issues, it's all here. Contents 1. BIOS and the booting up 2. Memory and HDD (Hard Disc Drive) problems 3. Video and sound cards 4. Make your PC environmentally friendly 5. Networking and USB BIOS and the booting up If your PC won't boot up properly and fails to show a display, then there are several ways to diagnose the problem. First of all you may be recieving beeping noises from your computer. These are perfectly normal and are there to help you decypher what's wrong with your PC. Here's a complete list of beep codes and there meanings: Award BIOS 1 long beep - A memory problem, remove and reseat the RAM 1 long, 2 short or 1 long, 3 short - Video card problem. Replace the graphics card or its memory Continuous - Memory and/or video card problems. Reseat video card and RAM Phoenix BIOS 1,1,3 - CMOS unreadable. Replace the motherboard 1,1,4 - BIOS failure. Replace the BIOS (explained later on) 1,2,1 - The timer chip has failed. Replace the motherboard 1,2,2 or 1,2,3 or 1,3,1 or 1,3,3 or 1,3,4 or 1,4,1 or 4,2,1 or 4,3,1 or 4,3,2 or 4,3,2 - Motherboard error, replace it 1,3,3 - Memory problems. Remove and reseat the RAM 1,4,2 - Faulty memory. Test and reaplce your RAM (testing exmplained alter on) 2,any,any - Any beeps after 2 indicates bad memory. Run a memory test and replace the RAM (testing exmplained alter on) 3,1,any - Faulty motherboard chip. Replace it 3,2,4 - Keyboard controller error. Replace keyboard controller chip or the motherboard 3,3,4 - No video card. Try removing and reseating it, or adding one 4,2,2 or 4,2,3 - Replace the keyboard. If this persists replace the motherboard 4,2,4 - Remove and replace all PCI cards one by one to find the faulty one. Replace it 4,3,4 - Clock error. Reset motherboard clock using its setup program. Replace CMOS battery if necessary. If this fails replace PSU (Power Supply Unit) 4,4,1 or 4,4,2 - Use motherboard manual to disable the serial ports and add an I/O card to replace them 4,4,3 - Maths coporcessor malfunctioning. Use a low-level diagnostic program to confirm this, then disable it AMI BIOS None - Faulty speaker, broken motherboard or PSU problem 1 short beep - RAM refresh, interrupt timer or interrupt controller failure. Replace motherboard 2 short beeps or 3 short beeps - Indicates memory problems. Check the seating of RAM or replace it 4 short beeps - System timer failure. Repalce motherboard 5 short beeps - CPU failure 6 short beeps - Keyboard controller chip error. Replace keyboard. If this persists chip may need to be reseated/replaced 7 short beeps - CPU exception error. Replace CPU and/or motherboard 8 short beeps - Video card failure. Reseat the graphics card 9 short beeps - ROM checksum error. BIOS ROM is bad. Replace it 10 short beeps - CMOS problem. Replace motherboard 11 short beeps - L2 cache memory failure. Replace L2 cache memory. 1 long, 3 short - Memory test failure in RAM over the first 64k 1 long, 8 short - Display test error. Missing or broken video card If you're uncertain of which BIOS you have, download this program, open it, click the Run button and where it says BIOS manufacturer, that's your BIOS. If beeps don't resolve your problem, you'll need to test each component individually. Here's how to: 1. Dismantle your PC completely, taking anti-static precautions. Take the motherboard out of the case and place it on a non-conductive surface. Remove everything excpt the processor, heatsink and memory. 2. Connect the power supply to the motherboard and speaker. Press the on switch. Do the heatsink fans turn? Can your hear any BIOS beeps? If not, remove the RAM and try again. 3. If the board seems to be recieving power, try connectiong the graphics card. DO this carefully, ensuring that you don't stress the PCI/AGP/PCI-e slot. Connect your monitor and power up the PC. Do you get a picture? If not, replace the graphics card and try again. If this fails the problem may be your PCI/AGP/PCI-e slot. 4. Now you can recieve power and a picture, so place the motherboard back in the case, lining it up correctly with the spacers to avoid shorting out. Reconnect the power, switch, speaker and graphics card and start the computer again to check taht it still works. 5. Connect your hard drives and start the computer. Are they detected? Does it begin to boot correctly? If not, check your BIOS settings, jumper configurations and trysubstituting the drives themselves. 6. Now you have a system that can boot, connect your remaining PCI cards and try starting again. If all goes well, you can reassemble the computer, connect your periphals and get it up and running once more.