MS-7374 Mainboard
LED 4, 5, 6, 7, 8, 9, 10, 11
These four LEDs allow users to identify system problems through 16 various combi- nations of LED signals.
LED4 
LED5 
LED6 
LED7 
LED8 
LED9 
LED10 
LED11 
Group4
Group3
Group2
Group1
Red
LED Signal
Group4
Group3
Group2
Group1
Group4
Group3
Group2
Group1
Group4
Group3
Group2
Group1
Group4
Group3
Group2
Group1
Group4
Group3
Group2
Group1
Group4
Group3
Group2
Group1
Group4
Group3
Group2
Group1
Group4
Group3
Group2
Group1
Green
Description
System Power ON
The
EarlyChipset Initialization
Memory Detection Test
Testing onboard memory size. The
Decompressing BIOS image to RAM for fast booting.
Initializing Keyboard Controller.
Testing VGA BIOS
This will start writing VGA
Processor Initialization
This will show information regarding the processor (like brand name, sys- tem bus, etc...)
Testing RTC (Real Time Clock)
| LED Signal | Description | |||
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| Group4 | Initializing Video Interface |
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| Group3 | This will start detecting CPU clock, |
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| Group2 | checking type ofvideo onboard. Then, |
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| Group1 | detect and initializethe video adapter. |
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| Group4 | BIOS Sign On |
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| Group3 | This will start showing information |
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| Group2 | about logo, processor brand name, |
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| Group1 | etc... |
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| Group4 | Testing Base and Extended Memory |
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| Group3 | Testing base memory from 240K to |
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| Group2 | 640K and extended memory above |
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| Group1 | 1MB using various patterns. |
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| Group4 |
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| Group3 | Assign Resources to all ISA. |
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| Group2 |
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| Group1 | Initializing Hard Drive Controller |
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| Group4 | |
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| Group3 | This will initialize IDE drive and |
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| Group2 | controller. |
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| Group1 |
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| Group4 | Initializing Floppy Drive Controller |
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| Group3 | This will initialize Floppy Drive and |
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| Group2 | controller. |
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| Group1 |
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| Group4 | BootAttempt |
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| Group3 | This will set low stack and boot via |
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| Group2 | INT 19h. |
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| Group1 | |
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| Group4 |
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| Group3 | Operating System Booting |
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| Group2 |
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| Group1 |
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