Random voice / sound going off

Hey there
i have had my macbook for about 7 months now, and its been about 3 days that this is actually happepning, there is like a random sounds like a beep goes off my speaker which last about 1 second about every 20 minuits
what could be the problem ?

HI,
Is the battery charged?
Do you have Growl installed? http://forums.macosxhints.com/showthread.php?t=87389
Try removing and reinstalling the battery. http://support.apple.com/kb/HT2037
Reset the PRAM/NVRAM. http://support.apple.com/kb/HT1379
Carolyn

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DRIVER_POWER_STATE_FAILURE (9f)
A driver is causing an inconsistent power state.
Arguments:
Arg1: 00000003, A device object has been blocking an Irp for too long a time
Arg2: 86280b60, Physical Device Object of the stack
Arg3: 82d79ae0, Functional Device Object of the stack
Arg4: 89b2d380, The blocked IRP
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IMAGE_NAME: pci.sys
DEBUG_FLR_IMAGE_TIMESTAMP: 4a5bbf14
MODULE_NAME: pci
FAULTING_MODULE: 8ae00000 pci
CUSTOMER_CRASH_COUNT: 1
DEFAULT_BUCKET_ID: VISTA_DRIVER_FAULT
BUGCHECK_STR: 0x9F
PROCESS_NAME: System
CURRENT_IRQL: 2
STACK_TEXT:
82d79a94 82c8f054 0000009f 00000003 86280b60 nt!KeBugCheckEx+0x1e
82d79b00 82c8e8e8 82d79ba0 00000000 82d86280 nt!PopCheckIrpWatchdog+0x1f5
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82d79c68 82cbceae 82d7cd20 82d79ca8 00000000 nt!KiProcessExpiredTimerList+0x101
82d79cdc 82cbb20e 002f3914 855f66f8 82d86280 nt!KiTimerExpiration+0x25c
82d79d20 82cbb038 00000000 0000000e 00000000 nt!KiRetireDpcList+0xcb
82d79d24 00000000 0000000e 00000000 00000000 nt!KiIdleLoop+0x38
STACK_COMMAND: kb
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BUCKET_ID: 0x9F_3_NETw5s32_IMAGE_pci.sys
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Random voice / sound going off

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