Last time the problem eventually started showing disk errors and the occassional blue screen flashed up, and the computer became totally inoperable (at least until it got into the store). After reading some reasonably similar posts here, I managed to find the error log in the event viewer, that corresponded with the 2 most recent crashes...
Event Type: Error
Event Source: System Error
Event Category: (102)
Event ID: 1003
Date: 1/29/2006
Time: 12:29:50 AM
User: N/A
Computer: HOME
Description:
Error code 1000000a, parameter1 9d066240, parameter2 00000002, parameter3 00000000, parameter4 8051ec1c.
For more information, see Help and Support Center at http://go.microsoft....link/events.asp.
Data:
0000: 53 79 73 74 65 6d 20 45 System E
0008: 72 72 6f 72 20 20 45 72 rror Er
0010: 72 6f 72 20 63 6f 64 65 ror code
0018: 20 31 30 30 30 30 30 30 1000000
0020: 61 20 20 50 61 72 61 6d a Param
0028: 65 74 65 72 73 20 39 64 eters 9d
0030: 30 36 36 32 34 30 2c 20 066240,
0038: 30 30 30 30 30 30 30 32 00000002
0040: 2c 20 30 30 30 30 30 30 , 000000
0048: 30 30 2c 20 38 30 35 31 00, 8051
0050: 65 63 31 63 ec1c