Product:
Cognos TM1 10.1
PLANANALYTICS_version=PLANANALYTICS-AW32-ML-RTM-10.1.6237.212-0
Microsoft Windows XP

Symptom:
The TM1 instance does not start – even do it is set too automatic in Windows services.

Error message in windows events:
Event Type: Error
Event Source: tm1sd
Event Category: None
Event ID: 0
Date: 7/27/2016
Time: 10:06:50 AM
User: N/A
Computer: VCLASSBASE
Description:
The description for Event ID ( 0 ) in Source ( tm1sd ) cannot be found. The local computer may not have the necessary registry information or message DLL files to display messages from a remote computer. You may be able to use the /AUXSOURCE= flag to retrieve this description; see Help and Support for details. The following information is part of the event: tm1sd error: 0, Corrupt “tm1s.log” transaction log file. Server is coming down.

In tm1server log you find:
2728 [] FATAL 2016-07-27 08:06:50.687 TM1.Transaction TM1TransactionLog::ProcessTransactionLog: Bad transaction log record, line number 1.
2728 [] FATAL 2016-07-27 08:06:50.687 TM1.Server Server terminated

In tm1s.log file there is:
#LOG_FORMAT=1
#LOGID=E
“”,”20160715135733″,”CubeSerialized: }CubeProperties: by Admin”
#””,”20160715135733″,”CubeSerialized: }DimensionProperties: by Admin”

Solution:
Erase the tm1s.log file and then start the service.