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ASUS A7N266-VM motherboard user guide
51
1. Cause for Hangup: Checksum Error Warning
“The CMOS checksum is incorrect. Please reload the cmos default
value.” To solve this problem, clear the CMOS RTC memory (see pages
22 and 59) and then reenter the default values in the BIOS Exit menu
and restart the system.
2. Cause for Hangup: Improper System Frequency
“Last time you failed to change the frequency of the system. It may place
the system into an unstable state. Now the system is in safe mode at the
slowest CPU speed. Please set the system frequency again.” To solve
this problem, a slower frequency is more likely to obtain stable start-ups.
CPU Upgrade/Reinstallation
To ensure that the system can enter BIOS Setup after replacing the processor,
the system starts up running at a bus speed of 100MHz and a fail-safe CPU
internal frequency. Then it automatically enters the Advanced menu with a
popup display of all the possible CPU internal frequencies for the particular
CPU presently installed:
3. Cause for Hangup: Improper CPU Speed 1
“During the last bootup, your system hung for an improper CPU Speed
setting. Your system is now working in safe mode. To optimize the system
performance and stability, make sure the CPU speed conforms to the
specifications of your CPU.”
4. Cause for Hangup: Improper CPU Speed 2
“Since you are using a new CPU or have reinstalled your CPU, the system
boots up at the slowest CPU bus frequency to make sure the system can
enter setup menu. Now, you can adjust the CPU speed as you wish. If
the speed is adjusted too high, the system may hang. Please turn off the
system and then restart to set the CPU speed.”
4.4.1 Summary of Warning Messages
(Jumperless Operation only)
The system may crash or hang up due to conflicts between settings and
CPU compatibility: checksum errors, improper frequency settings, change
of CPU and improper CPU speed settings. The system starts up in safe
mode running at a bus speed of 100MHz and enters the BIOS Setup. Each
time a system hangup occurs, BIOS interrupts the bootup process with a
specific warning message. These messages always appear on the right
side of the BIOS screen in red print: