Lenovo ThinkPad i Series 1124 ThinkPad 240 User's Reference that shipped with - Page 120

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Troubleshooting charts Other problems Problem The computer locks or does not accept any input. The computer does not turn off with the power switch. The computer does not start from a diskette. Performance degrades when the computer gets hot during use. A memory shortage or memory error occurs. Action Your computer might lock when it enters suspend mode during a communication operation. Disable the Suspend Timer when you are working on the network. To turn off the computer, push and hold the power switch for about five seconds, then release it. If the suspend indicator is on and you are working under battery power, change the battery to a fully charged one or change your power source to AC power. If you still have a problem, push and hold the power switch for about five seconds, then release it to turn off the computer. Restart the computer. Make sure that the startup sequence in the BIOS Setup Utility is set so that the computer starts up from the diskette drive (see "Startup" on page 27). The processor speed might decrease under the following conditions: Use in a hot environment High-powered processing that requires high-power consumption This is not a defect. If you are using DOS: 1. Use the DOS command MEM /C to review your DOS memory usage occasionally. 2. Unload any unnecessary drivers from the CONFIG.SYS file. (For example, unload printer drivers if you do not use a printer.) 3. Reconfigure the UMB (upper memory block) using the DEVICEHIGH statement. 4. Use the multiple configuration setup for DOS (refer to the documents supplied with DOS). 108 ThinkPad 240 User's Reference

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Troubleshooting charts
Other problems
Problem
Action
The computer locks or
does not accept any
input.
±
Your computer might lock when it enters suspend mode during a communi-
cation operation. Disable the Suspend Timer when you are working on the
network.
±
To turn off the computer, push and hold the power switch for about five
seconds, then release it.
The computer does not
turn off with the power
switch.
If the suspend indicator is on and you are working under battery power, change
the battery to a fully charged one or change your power source to AC power.
If you still have a problem, push and hold the power switch for about five seconds,
then release it to turn off the computer. Restart the computer.
The computer does not
start from a diskette.
Make sure that the startup sequence in the BIOS Setup Utility is set so that the
computer starts up from the diskette drive (see “Startup” on page
27).
Performance degrades
when the computer gets
hot during use.
The processor speed might decrease under the following conditions:
±
Use in a hot environment
±
High-powered processing that requires high-power consumption
This is not a defect.
A memory shortage or
memory error occurs.
±
If you are using DOS:
1. Use the DOS command MEM /C to review your DOS memory usage
occasionally.
2. Unload any unnecessary drivers from the CONFIG.SYS file. (For example,
unload printer drivers if you do not use a printer.)
3. Reconfigure the UMB (upper memory block) using the DEVICEHIGH
statement.
4. Use the multiple configuration setup for DOS (refer to the documents sup-
plied with DOS).
108
ThinkPad 240 User's Reference