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...
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
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.