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December 21st, 2014, 09:10 PM
#1
Cannot boot from CD
Motherboard is a 2-month old Gigabyte GA-78LMT-USB3 (rev. 5).
In the BIOS, 1st boot device is set to CD.
I was able to boot from CD before ... I clean installed the Win 7 via CD.
Now it can't anymore.
CD drive is definitely working.
I've tried the following:
Reset CMOS (pull battery)
Plug CD drive in all different SATA ports
Use different CD's including a "Win 7 Repair Disc", a "Win 7 Pro Setup disc" and a "Win 7 Home Premium disc". (All are know good disc.)
Any idea what else can I try?
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December 21st, 2014, 09:23 PM
#2
Try using a CD cleaning disk. They're available at computer stores or stores that sell CD's/DVD's. They have tiny brushes on them that clean the Laser.
Biostar TA790GX A2+ 6.0
AMD Phenom X4 9750 CPU.
4 Gig DDR2 Memory.
ATI HD 5450 PCIe Video
ATI HD 5450 PCIe Video
500 Watt P.S.
LG W2241T Widescreen 22" LCD
ViewSonic VA721 17" LCD
Envision 17" LCD
2 LG DVD Drives
Floppy Disk Drive
Maxtor 120 Gig Windows 7 Home Premium 32 bit
Gateway NV5378-U Windows 7 Home Premium 64 bit
Acer Aspire V3-731 Windows 7 Home Premium 64 bit
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December 21st, 2014, 10:12 PM
#3
Had to clean 3 out of 4 new cd/dvd burns I have installed new.
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December 21st, 2014, 10:34 PM
#4
The drive is good but I just cleaned it as suggested anyway. It still won't do. CD drive is fully functional in Windows.
The mobo has the latest BIOS already.
Any other suggestion.
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December 22nd, 2014, 12:04 AM
#5
New Information
New Information:
If I unplug the HDD, then it WILL boot from the CD drive!
This probably I didn't have trouble installing Win 7 from CD the first time around b/c back then the HDD was blank w/o an OS.
But this is so strange though.
I even suspected that maybe I just missed the "Press any key to boot from CD" message, so I've tried just keep tapping the "P" key continuously from the moment I power on the computer but still no luck.
This is messed up!
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December 22nd, 2014, 12:42 AM
#6
More Info still:
There is a F12 Boot Menu function, so I try that. It is a menu to set the first boot device. Curiously, it indicates the HDD is the first boot device even though I have already set in CMOS the CD drive to be the 1st. So I select the CD drive in this boot menu. But still it won't go and the next time I go back to this F12 Boot Menu, sure enough, the HDD is still list as the first. Sounds like a bug in the BIOS!
One response from Gigabyte:
Searching the web, I come upon another user having the same problem (w/ a different Gigabyte mobo though) and he asked Gigabyte and Gigabyte said, to unplug the HDD, wait to confirm it has been booted from the CD, then, plug in the HDD!!
My question is this: I know SATA drive is supposed to be hot-pluggable, but are they really? I mean, with power already on, you then plug the drive in? Will it hurt the drive? Anyone has any experience on this?
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December 22nd, 2014, 01:34 AM
#7
Solved
Ok, here is how I get it to boot from CD drive:
There are a total of 6 SATA ports in 2 groups.
Port 0, 1, 2, 3 in one group (let's call it Group 1) and Port 4, 5 in the other (Group 2).
For Group 1, the choices are IDE, RAID and AHCI.
For Group 2, the choices are IDE, SATA.
Originally I have Group 1 set as AHCI and Group 2 as SATA.
I plug both my SATA HDD and CDD in Group 1 (Port 0, 1 respectively.)
Won't boot from the CDD.
Then I move the CDD in Port 4 (Group 2).
Still won't boot from the CDD.
Then I set Group 2 to IDE.
Wham, it now boot from the CDD.
My theory:
Remember my other thread here: Confused BIOS?
In that thread we discuss about how both my HDD and CDD are not listed during P.O.S.T. nor are they listed in the BIOS. And my conclusion after some researching is that b/c I have set those SATA ports (0, 1, 2, 3) as AHCI, they are being handled by a separate AHCI BIOS rather than the "regular" BIOS, see Post #21 in that thread.
I think that's why even I set the CDD as the 1st device in the "regular" BIOS, it won't take. Now I set the port (4, 5) as IDE and they are now being handled by the "regular" BIOS and therefore setting the CDD as the 1st device is now working as expected.
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December 22nd, 2014, 02:53 PM
#8
That sounds like a logical explanation. Thanks for posting the update.
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