UPGRADING REPAIRING PCs
UPGRADING REPAIRING PCs
UPGRADING REPAIRING PCs
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Other BIOS Troubleshooting Tips 77<br />
When to Use the PnP BIOS Configuration Options<br />
In an ideal situation involving PnP-aware operating systems—such<br />
as Windows 9x or 2000, a computer with a PnP BIOS, and a PnP<br />
device—the BIOS detects the PnP device and Windows configures it<br />
without user intervention. Table 3.5 lists the circumstances under<br />
which you might need to use PnP BIOS configuration options.<br />
Table 3.5 Solving Configuration Problems with the PnP BIOS<br />
Configuration Options<br />
Problem Solution Notes<br />
Legacy (non-PnP) card Set DMA and IRQ used by This prevents PnP devices<br />
needs particular IRQ legacy card to “ISA” from using the resource;<br />
or DMA setting already option in BIOS. verify legacy card setting<br />
in use by PnP device. matches BIOS selections.<br />
Windows 9x/Me/2000 is not Set “Plug and Play Aware<br />
detecting and configuring Operating System” option<br />
PnP devices not needed at<br />
boot time (such as modems,<br />
printers, and so on).<br />
to “Yes” in BIOS.<br />
PCI video card is assigned Set “Assign IRQ to VGA” This frees up the IRQ withan<br />
IRQ that you need for option to “No” in BIOS. out ill effects in most<br />
another device. cases; might not work if the<br />
video card is used for MPEG<br />
movie playback.<br />
New PnP device can’t be Set “PCI Slot x IRQ Priority” If setting the IRQ for the PCI<br />
detected by system. to desired (unused) IRQ; slot doesn’t work, remove<br />
install card into designated all non-essential PnP cards,<br />
PCI slot. install new PnP card first,<br />
and then reinstall others.<br />
Other BIOS Troubleshooting Tips<br />
Use Table 3.6 to help solve some other typical system problems<br />
through BIOS configuration settings.<br />
Table 3.6<br />
Problems<br />
Troubleshooting Common BIOS-Related System<br />
Problem Solution Notes<br />
Can’t access system Passwords are stored Remove battery on motherboard and<br />
because passwords in CMOS non-volatile wait for all CMOS settings to be lost<br />
for startup or setup RAM (NVRAM) and are or use MB jumper called “clear<br />
access aren’t known. configured through BIOS. CMOS”; before clearing CMOS, view<br />
bootup configuration information and<br />
note hard drive and other configuration<br />
information, because all setup<br />
information must be re-entered after<br />
CMOS is cleared.
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