Blue screen appears on startup and at shutdown

A few months ago, I bought a macbook pro and it was doing fine. But recently, every time it starts, a blue screen appears for a split second then it goes to log- in. Then, every time I shutdown, it will also show up for a split second then shutdown. It doesn't affect the computer but I'm just wondering how to stop it.

I couldn't rember what time it started so, I shut down my computer and the blue screen appereed at 8:39:28. But went I turned it on, the blue screen did not show. So, I turnned it of and on again and no blue screen. I did it several times and now the blue screen isn't showing. But I will post the test that showed in the concel during 8:39, when it powered of blue, to the time I powed it on, when the blue screen did not show. If you need more, I will try to give it to you. I'll post again if it shows up again. Also I should edit out ethernet address too right?
Here's what its says:
8:38:07 PM kernel: I0Surface: buffer allocation size is zero
8:38:47 PM kernel: I0Surface: buffer allocation size is zero
8:39:28 PM mds: (Error) Server: ==== XPC handleXPCMessage XPC_ERROR_CONNECTION_INVALID
8:39:28 PM com.apple.launched.peruser.501: (com.apple.talagent.[236]) Exited: Killed: 9
2/19/12 8:39:28.145 PM
com.apple.launchd.peruser.501
([0x0-0x18018].com.apple.iTunesHelper[284]) Exited: Killed: 9
2/19/12 8:39:28.145 PM
com.apple.launchd.peruser.501
([0x0-0x13013].com.apple.AppleSpell[260]) Exited: Killed: 9
2/19/12 8:39:28.147 PM
com.apple.launchd.peruser.501
(com.apple.mdworker.pool.0[452]) Exited: Terminated: 15
2/19/12 8:39:28.203 PM
loginwindow
DEAD_PROCESS: 36 console
2/19/12 8:39:28.467 PM
shutdown
halt by ___________:
2/19/12 8:39:28.467 PM
shutdown
SHUTDOWN_TIME: 1329701968 466888
2/19/12 8:39:54.000 PM
bootlog
BOOT_TIME 1329701994 0
2/19/12 8:40:06.000 PM
kernel
PMAP: PCID enabled
2/19/12 8:40:06.000 PM
kernel
Darwin Kernel Version 11.3.0: Thu Jan 12 18:47:41 PST 2012; root:xnu-1699.24.23~1/RELEASE_X86_64
2/19/12 8:40:06.000 PM
kernel
vm_page_bootstrap: 986092 free pages and 54292 wired pages
2/19/12 8:40:06.000 PM
kernel
kext submap [0xffffff7f8072f000 - 0xffffff8000000000], kernel text [0xffffff8000200000 - 0xffffff800072f000]
2/19/12 8:40:06.000 PM
kernel
zone leak detection enabled
2/19/12 8:40:06.000 PM
kernel
standard timeslicing quantum is 10000 us
2/19/12 8:40:06.000 PM
kernel
mig_table_max_displ = 73
2/19/12 8:40:06.000 PM
kernel
TSC Deadline Timer supported and enabled
2/19/12 8:40:06.000 PM
kernel
AppleACPICPU: ProcessorId=1 LocalApicId=0 Enabled
2/19/12 8:40:06.000 PM
kernel
AppleACPICPU: ProcessorId=2 LocalApicId=2 Enabled
2/19/12 8:40:06.000 PM
kernel
AppleACPICPU: ProcessorId=3 LocalApicId=4 Enabled
2/19/12 8:40:06.000 PM
kernel
AppleACPICPU: ProcessorId=4 LocalApicId=6 Enabled
2/19/12 8:40:06.000 PM
kernel
AppleACPICPU: ProcessorId=5 LocalApicId=1 Enabled
2/19/12 8:40:06.000 PM
kernel
AppleACPICPU: ProcessorId=6 LocalApicId=3 Enabled
2/19/12 8:40:06.000 PM
kernel
AppleACPICPU: ProcessorId=7 LocalApicId=5 Enabled
2/19/12 8:40:06.000 PM
kernel
AppleACPICPU: ProcessorId=8 LocalApicId=7 Enabled
2/19/12 8:40:06.000 PM
kernel
calling mpo_policy_init for TMSafetyNet
2/19/12 8:40:06.000 PM
kernel
Security policy loaded: Safety net for Time Machine (TMSafetyNet)
2/19/12 8:40:06.000 PM
kernel
calling mpo_policy_init for Sandbox
2/19/12 8:40:06.000 PM
kernel
Security policy loaded: Seatbelt sandbox policy (Sandbox)
2/19/12 8:40:06.000 PM
kernel
calling mpo_policy_init for Quarantine
2/19/12 8:40:06.000 PM
kernel
Security policy loaded: Quarantine policy (Quarantine)
2/19/12 8:40:06.000 PM
kernel
Copyright (c) 1982, 1986, 1989, 1991, 1993
2/19/12 8:40:06.000 PM
kernel
The Regents of the University of California. All rights reserved.
2/19/12 8:40:06.000 PM
kernel
MAC Framework successfully initialized

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Blue screen appears on startup and at shutdown

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