By :www.hardwaresecrets.com/article/42
Preventing Overheating
If you want to ensure that you won’t face overheating, random crashes (resets and the infamous “Blue Screen of Death”) and performance issues with your PC you should check whether it is assembled 100% correctly or not. In this tutorial we will show you where to look for assembling errors on your PC.
First, let’s start with the PC assembly itself. The errors describe on this page can overheat your PC thus causing random problems like random resets and crashes (PC “freezing”, “Blue Screen of Death”, etc).
Antistatic foam: Most motherboards come from factory with an antistatic foam (usually pink, white or black) in their packing. Many technicians, when installing the motherboard to the case, pinch this foam between motherboard and metallic chassis, thinking that this procedure will avoid that motherboard from touching the case metallic frame. It happens that this foam holds motherboard-generated heat, hindering the normal airflow that exists between motherboard and the case chassis. Therefore, it is quite common that a computer assembled using this foam crashes or issues random errors, due to the overheating.
Internal main power cord: In AT cases it is quite common to have the main power cord that connects the power supply to the power-on switch in front panel hanging loose over motherboard, often hindering the heat dissipation and even contacting the processor fan, causing it to stop running and PC to crash due to overheating. The ideal would be to lay this cable to the power supply switch by the right side of the case (facing front of case in upright position), in the upper part of the frame, and not hanging loose by left side, as it is common to find. Since AT cases are used only on very old PCs, you probably won’t face this issue, however we kept it listed here for historic purposes.
Other loose cables: The same idea applies to all other cables inside the PC, like the power supply cables and the flat cables used to connect the hard disk drives, optical drives and floppy disk drives. You should fasten these cables with a cable holder and put them inside an empty 5 ¼” bay in order to prevent these cables from blocking the airflow inside the PC and also preventing them to stuck the CPU fan.
Thermal grease: If you are facing overheating problems with your CPU, you should check whether thermal grease was correctly applied on the CPU or not.
Under dimensioned case: Cases look all the same, but they aren’t. Current Intel CPUs (Pentium 4 “Prescott” and beyond) require cases with a side duct in order to improve the airflow inside the case. If you don’t use a case with this side duct you may face overheating problems.
Extra fans wrongly installed: If your case has extra fans, you should check if they are installed on the right position, i.e. blowing the air in the right direction. Fans installed on the rear part of the case must be installed pulling the hot air from inside the PC case to the outside. Fans installed on the front part of the case must be installed pushing cold air from outside the case to the inside. Putting your hand near the fan should be enough for you to feel which way it is blowing air. If any extra fan is reversed, just remove it from your case and install it again, flipping it over.
The problems listed below are not directly related to overheating, but you should check them as well.
Loose motherboard: Your motherboard must be very well fastened to case's metallic frame. We've seen many cases where the computer gives random resets or crashes when the desk was rocked, just because the motherboard was practically loose inside the case. In other cases, it is very common for the PC to lose its machine setup when a new daughter board is installed, as motherboard bends (due to lack of padding points) and some of the motherboard soldering points contact the metallic frame. Therefore your motherboard must be very well fastened to case's frame, using the largest quantity of fastening points as possible.
Hard disk flat cable: If you still use a parallel IDE hard disk drive (e.g. ATA-100, ATA-133) instead of Serial ATA (SATA), you should check carefully how it is installed. Parallel IDE hard disk drives use a 40- or 80-wire flat cable that normally has three connectors, one in each cable end and one midway. The hard disk must be connected to one end of the cable and motherboard to the other end. The midway connector stays normally loose. It happens that some technicians connect the hard disk to the midway connector, is such a way that a cable end connector hangs loose. This is not good, as this stretch of the cable will actuate as an antenna, receiving and injecting noise in the data transmission, and as such hard disk transfer rate will be reduced. Also, if your hard disk cable is using a 40-wire flat cable, we recommend you to replace it with an 80-wire cable
Optical drive as hard disk slave: Also if you still use a parallel IDE hard disk drive, the optical drive (CD, DVD, etc) must be installed in the secondary IDE port of motherboard, configured as "master". Many people install the optical drive on the same cable as hard disk (using that midway connector that stays usually empty), as "slave". In that way the hard disk drive and the optical drive will have to strive for cable utilization, as they use same cable, and both devices can't change information with the system processor simultaneously, reducing computer performance. If your computer optical drive is sharing the same cable as the hard disk drive, undo this installation: install it on the motherboard secondary IDE port as “master” (you will need a 40- or 80-wire flat cable). Newer motherboards, however, are coming with just one parallel IDE port (see Figure 11), giving us no other option than installing the optical drive and the hard disk drive on the same cable. If this is your case, we highly recommend you to replace your hard disk drive with a Serial ATA one in order to leave the optical unit alone on the parallel IDE port, thus increasing system disk performance.
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