My computor says it has been interrupted it does diagonostic says error 303

Dell beep codes:

If your computer beeps during start-up:
Run Dell Diagnostics to identify a more serious cause.

Beep Codes Your computer might emit a series of beeps during start-up if the monitor cannot display errors or problems. This series of beeps, called a beep code, identifies a problem. One possible beep code (code 1-3-1) consists of one beep, a burst of three beeps, and then one beep. This beep code tells you that the computer encountered a memory problem.
If your computer beeps during start-up:
Dell Diagnostics to identify a more serious cause.

Contact Dell for technical assistance.




Code Cause 1-1-2 Microprocessor register failure 1-1-3 NVRAM read/write failure 1-1-4 ROM BIOS checksum failure 1-2-1 Programmable interval timer failure 1-2-2 DMA initialization failure 1-2-3 DMA page register read/write failure 1-3 Video Memory test failure 1-3-1 through 2-4-4 Memory not being properly identified or used 3-1-1 Slave DMA register failure 3-1-2 Master DMA register failure 3-1-3 Master interrupt mask register failure 3-1-4 Slave interrupt mask register failure 3-2-2 Interrupt vector loading failure 3-2-4 Keyboard Controller test failure 3-3-1 NVRAM power loss 3-3-2 Invalid NVRAM configuration 3-3-4 Video Memory test failure 3-4-1 Screen initialization failure 3-4-2 Screen retrace failure 3-4-3 Search for video ROM failure 4-2-1 No timer tick 4-2-2 Shutdown failure 4-2-3 Gate A20 failure 4-2-4 Unexpected interrupt in protected mode 4-3-1 Memory failure above address 0FFFFh 4-3-3 Timer-chip counter 2 failure 4-3-4 Time-of-day clock stopped 4-4-1 Serial or parallel port test failure 4-4-2 Failure to decompress code to shadowed memory 4-4-3 Math-coprocessor test failure 4-4-4 Cache test failure

do you know which bios your computer is running ?

AMI BIOS beep codes 1 beep - DRAM refresh failure
2 beeps - Parity Circuit Failure
3 beeps - Base 64K RAM failure
4 beeps - System Timer Failure
5 beeps - Processor Failure
6 beeps - Keyboard Controller / Gate A20 Failure
7 beeps - Virtual Mode Exception Error
8 beeps - Display Memory Read/Write Failure
9 beeps - ROM BIOS Checksum Failure
10 beeps - CMOS Shutdown Register Read/Write Error

Phoenix BIOS BEEP codes. 1-1-3 CMOS write/read failure.
1-1-4 BIOS ROM checksum error.
1-2-1 System timer failure. (Programmable Interval Timer PIT)
1-2-2 DMA (direct Memory Access) failure.
1-2-3 DMA page register failure.
1-3-1 RAM refresh failure.
1-3-3 64K RAM chip or data line failure.
1-3-4 64K RAM odd/even logic failure.
1-4-1 64K RAM address line failure.
1-4-2 64K RAM parity error.
2-?-? Any beep series starting with 2 beeps indicates a 64K RAM chip or data line error.
3-1-1 Master DMA register test.
3-1-2 Mslave DMA register failure.
3-1-3 Master interrupt mask register failure.
3-1-4 Slave interrupt mask register failure.
3-2-4 Keyboard controller failure.
3-3-4 Screen (video) memory failure.
3-4-1 Screen initialization failure.
3-4-2 Screen retrace failure.
4-2-1 Timer tick interrupt test failure.
4-2-2 Shutdown test failure.
4-2-4 Unexpected interrupt in protected mode.
4-3-1 RAM test failure above address 0FFFFh (64K +)
4-3-3 Interval timer channel 2 test failure.
4-3-4 Time of day clock failure.
4-4-1 Serial port test failure.
4-4-2 Parallel port test failure.
4-4-3 Math Co-processor failure.
BEEP codes may vary dependent upon the revision of BIOS. This list is for reference only

hope this helps

ok if you can scan and check for viruses sometimes virus can play havoc on your computor if that doesnt solve it and if it is under warranty take it back where you got it from and tell them the problem.

how many beeps you have?if three short beeps its you RAM failure..try to reinsert you RAM or replaced it a new RAM..if theres a long beep..its your video card..

Make sure there is nothing attached to the laptop,remove all devices like keyboard,mouse, flash drives and retry. If still having same error flip the laptop over and remove the battery and open up the 2 other compartments that have a screw holding them. One holds the memory modules and the other the hard drive, check and re seat all connections, then try again. If you still have the same error your hard drive is most likely failing,
Thanks for using FixYa

here are some of the basic codes, depending on which BIOS you have...

Also you do not indicate which fan? I would guess you mean the main Power Supply (PS)? In which case it could just be you need to replace the PS.

Here is a link to some other codes as well...
http://www.computerhope.com/beep.htm

AMI BIOS ERROR BEEP CODES

• 1 Beep - Memory Refresh Failure (check memory)
• 2 Beeps - Memory Parity Error in first 64KB block (check memory)
• 3 Beeps - Memory Read/Write Error in first 64KB block (check memory)
• 4 Beeps - Motherboard timer not functioning (possible motherboard replacement)
• 5 Beeps - Processor Error (may need replacement Processor)
• 6 Beeps - Gate A20/keyboard controller failure (possible motherboard replacement)
• 7 Beeps - Processor Exception Interrupt Error (may need replacement Processor)
• 8 Beeps - Display Memory Read/Write Failure (reseat or replace video card)
• 9 Beeps - ROM checksum Error (replace BIOS chip or motherboard)
• 10 Beeps - CMOS shutdown Read/Write error (possible motherboard replacement)
• 11 Beeps - Bad Cache Memory - test failed (replace cache memory)

Phoenix BIOS ERROR BEEP CODES
Phoenix BIOS beep codes are a series of beeps separated by a pause, for example:
beep --- beep beep --- beep --- beep beep would be 1-2-1-2

• 1-1-4-1 - Cache Error (level 2)
• 1-2-2-3 - BIOS ROM Checksum
• 1-3-1-1 - DRAM Refresh Test
• 1-3-1-3 - Keyboard controller test
• 1-3-4-1 - RAM Failure on address line xxxx (check memory)
• 1-3-4-3 - RAM Failure on data bits xxxx of low byte of memory bus
• 1-4-1-1 - RAM Failure on data bits xxxx of high byte of memory bus
• 2-1-2-3 - ROM copyright notice
• 2-2-3-1 - Test for unexpected interrupts

I hope this helps.

820 Self-diagnostic error: CPU

Symptom:
• An unexpected exception or
interruption occurs during the self-
diagnostic test.
• An error is detected in the MBU.

Possible Cause:
• Defective controller
• Defective firmware
• Loose MBU jumper


Code 820
MBU error (The jumper is loose.)
Set the jumper (on the MBU) correctly.
The following codes are displayed:
• SC: 820
• code: 612
• detail: 40000000

here are the beep codes for your exact dell model. this should give you a starting point on finding out what the problem is.

Beep Codes Your computer might emit a series of beeps during start-up if the monitor cannot display errors or problems. This series of beeps, called a beep code, identifies a problem. One possible beep code (code 1-3-1) consists of one beep, a burst of three beeps, and then one beep. This beep code tells you that the computer encountered a memory problem.
Reseating the memory modules may fix the beep code errors in the following table. If the problem persists, see "Contacting Dell" in your Owner's Manual for instructions on obtaining technical assistance.
Code
Cause
1-3-1 through 2-4-4
Memory not being properly identified or used
4-3-1
Memory failure above address 0FFFFh

If you hear one of the following beep codes, see "Contacting Dell" in your Owner's Manual for instructions on obtaining technical assistance.
Code
Cause
1-1-2
Microprocessor register failure
1-1-3
NVRAM
1-1-4
ROM BIOS checksum failure
1-2-1
Programmable interval timer
1-2-2
DMA initialization failure
1-2-3
DMA page register read/write failure
3-1-1
Slave DMA register failure
3-1-2
Master DMA register failure
3-1-3
Master interrupt mask register failure
3-1-4
Slave interrupt mask register failure
3-2-2
Interrupt vector loading failure
3-2-4
Keyboard Controller Test failure
3-3-1
NVRAM power loss
3-3-2
NVRAM configuration
3-3-4
Video Memory Test failure
3-4-1
Screen initialization failure
3-4-2
Screen retrace failure
3-4-3
Search for video ROM failure
4-2-1
No time tick
4-2-2
Shutdown failure
4-2-3
Gate A20 failure
4-2-4
Unexpected interrupt in protected mode
4-3-3
Timer-chip counter 2 failure
4-3-4
Time-of-day clock stopped
4-4-1
Serial or parallel port test failure
4-4-4
Cache test failure

Do you get video? If so then it could be a stuck key on the keyboard.

Do you get no video? If so then reseat the RAM.