Which power suply are you using? With the number of drives, ram sticks and graphics card in your system, you will need a minimum of 400W. That is excluding the chasis fans and cathodes (if you have any).
Have you reset the BIOS to default? Did you do a BIOS update recently?
BIOS update > 
Intel Desktop Board DG35EC - BIOS Version 0072 fixes the following issues:• Fixed issue where system won’t boot with E7300 processor
installed.
• Fixed very long boot time on DG35EC and more than 6GB of RAM.
• Fixed issue where system would boot to PXE even when first boot
device is set to IDE.
• Fixed issue where device name of the primary master drive does
not show in BIOS when a PATA and a SATA drive are attached.
• Fixed issue when all bootable devices are disabled, can’t enter
BIOS Setup via the F2 key.
• Modified OEM table ID.
• Fixed display of processor temperature (Tbase) in BIOS for
certain processors.
Mixing RAM is NEVER a good idea as the timings are way different on different brands and capacity.DIMM1: Kingmax KLDE88F-B8MO5 2GB DDR2 800Mhz
DIMM2: Transcend JM800QLU-2G 2GB DDR2-800Mhz
DIMM3: Transcend JM800QLU-2G2 GB DDR2-800Mhz
DIMM4: Samsung M3 78T5663EH3-CF7 2GB DDR2-800Mhz
Try booting with only the 2 Transcend ram sticks
Have you run diagnostics on your hard drives?Failing drives may also cause a system to post slowly or not at all, looking at your log file, one of your hard drives is on it's way out:
System Error None 2011-12-01 05:21:21 Disk 7: The device, \Device\Harddisk1\DR1, has a bad block.
System Error None 2011-12-01 05:21:24 Disk 7: The device, \Device\Harddisk1\DR1, has a bad block.
System Error None 2011-12-01 05:21:28 Disk 7: The device, \Device\Harddisk1\DR1, has a bad block.
System Error None 2011-12-01 05:21:32 Disk 7: The device, \Device\Harddisk1\DR1, has a bad block.
System Error None 2011-12-01 05:21:35 Disk 7: The device, \Device\Harddisk1\DR1, has a bad block.
System Error None 2011-12-01 05:21:40 Disk 7: The device, \Device\Harddisk1\DR1, has a bad block.
System Error None 2011-12-01 05:21:44 Disk 7: The device, \Device\Harddisk1\DR1, has a bad block.
System Error None 2011-12-01 05:21:48 Disk 7: The device, \Device\Harddisk1\DR1, has a bad block.
System Error None 2011-12-01 05:21:51 Disk 7: The device, \Device\Harddisk1\DR1, has a bad block.
System Error None 2011-12-01 05:21:54 Disk 7: The device, \Device\Harddisk1\DR1, has a bad block.
System Error None 2011-12-01 05:22:21 Disk 7: The device, \Device\Harddisk1\DR1, has a bad block.
System Error None 2011-12-01 05:22:24 Disk 7: The device, \Device\Harddisk1\DR1, has a bad block.
System Error None 2011-12-01 05:22:27 Disk 7: The device, \Device\Harddisk1\DR1, has a bad block.
System Error None 2011-12-01 05:22:30 Disk 7: The device, \Device\Harddisk1\DR1, has a bad block.
System Error None 2011-12-01 05:22:34 Disk 7: The device, \Device\Harddisk1\DR1, has a bad block.
System Error None 2011-12-01 05:22:38 Disk 7: The device, \Device\Harddisk1\DR1, has a bad block.
System Error None 2011-12-01 05:22:42 Disk 7: The device, \Device\Harddisk1\DR1, has a bad block.
System Error None 2011-12-01 05:23:21 Disk 7: The device, \Device\Harddisk1\DR1, has a bad block.
System Error None 2011-12-01 05:23:42 Disk 7: The device, \Device\Harddisk1\DR1, has a bad block.
System Error None 2011-12-01 05:23:52 Disk 7: The device, \Device\Harddisk1\DR1, has a bad block.
Diagnostics utilities:SAMSUNG HD103SI ATA Device (1000 GB, 5400 RPM, SATA-II) >>
ST31000524AS ATA Device (1000 GB, 7200 RPM, SATA-III) >>
Maxtor 6G160P0 ATA Device (160 GB, 7200 RPM, Ultra-ATA/133)
Both the Seagate and Maxtor drives can be tested with same utility since Maxtor is now owned by Seagate
Check your CPU fan and heatsink. Fan speed seems a bit low and temperature is higher than my overclocked Phenom
Motherboard 44 °C (111 °F)
CPU 63 °C (145 °F)
Cooling Fans:
CPU 644 RPM
Chassis 1140 RPM
Power Supply 654 RPM
GPU 2020 RPM (46%)
Also try and listen to the BIOS beep codes >>
and have a look at the post codes (if display is functional) >>
Let us know what the issue is/was once you have checked the trouble shooting steps above
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