See if this can help you narrow it down, 750i should have an Award Bios.
-1 long, 2 short
-Video adapter error
-Either video adapter is bad or is not seated properly. Also, check to ensure the monitor cable is connected properly.
-Repeating (endless loop):
-Memory error
-Check for improperly seated or missing memory.
-1 long, 3short
-No video card or bad video RAM
-Reseat or replace the video card.
-High frequency beeps while running:
-Overheated CPU
-Check the CPU fan for proper operation. Check the case for proper air flow.
-Repeating High/Low:
-CPU
-Either the CPU is not seated properly or the CPU is damaged. May also be due to excess heat. Check the CPU fan or BIOS settings for proper fan speed.
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