Have you made sure that the ISO image you downloaded isn't corrupt? Try downloading it manually, and see if that makes a difference.
improbable.
$ unzip -tv ReactOS-0.3.11-REL-iso.zip Archive: ReactOS-0.3.11-REL-iso.zip testing: ReactOS.iso OK No errors detected in compressed data of ReactOS-0.3.11-REL-iso.zip.
I found just now the cause... I unpacked zip wrongly. sorry.
$ unzip ReactOS-0.3.11-REL-iso.zip $ unzip -c ReactOS-0.3.11-REL-iso.zip > ReactOS-0.3.11-REL-iso $ md5sum ReactOS* d773bd6c69869f4f7ad32831d50a8b10 ReactOS-0.3.11-REL-iso faf16fdbf5713b5443dcaeee8d5fab91 ReactOS-0.3.11-REL-iso.zip 9411dcb2635111d55a52e66c80dcbab8 ReactOS.iso
-> md5sum different
- ReactOS.iso: boot successful - ReactOS-0.3.11-REL-iso: Error: CDROM boot failure code : 0005
- summary: do not use unzip stdout
- btwn: different is minimal:
$ hexdump -C -n 32864 ReactOS-0.3.11-REL-iso | more 00000000 41 72 63 68 69 76 65 3a 20 20 52 65 61 63 74 4f |Archive: ReactO| 00000010 53 2d 30 2e 33 2e 31 31 2d 52 45 4c 2d 69 73 6f |S-0.3.11-REL-iso| 00000020 2e 7a 69 70 0a 20 20 69 6e 66 6c 61 74 69 6e 67 |.zip. inflating| 00000030 3a 20 52 65 61 63 74 4f 53 2e 69 73 6f 20 20 20 |: ReactOS.iso | 00000040 20 20 20 20 20 20 20 20 20 20 0a 00 00 00 00 00 | ......| 00000050 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |................| * 00008040 00 00 00 00 00 00 00 00 00 00 00 01 43 44 30 30 |............CD00| 00008050 31 01 00 20 20 20 20 20 20 20 20 20 20 20 20 20 |1.. | 00008060
- begin at 0x804a, shoud be 0x8000
$ hexdump -C -n 32864 ReactOS.iso | more 00000000 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |................| * 00008000 01 43 44 30 30 31 01 00 20 20 20 20 20 20 20 20 |.CD001.. | 00008010 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 | | 00008020 20 20 20 20 20 20 20 20 52 45 41 43 54 4f 53 20 | REACTOS | 00008030 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 | | 00008040 20 20 20 20 20 20 20 20 00 00 00 00 00 00 00 00 | ........| 00008050 31 5d 00 00 00 00 5d 31 00 00 00 00 00 00 00 00 |1]....]1........| 00008060
Heiko