ASUS AMD Radeon HD 6870 1 GB GDDR5 Video Card EAH6870/2DI2S/1GD5.
Western Digital 1 TB Caviar Green SATA Intellipower 64 MB Cache Hard Drive WD10EARS
LiteOn iHBS212 - Disk drive - BD-RE - 12x2x8x - Serial ATA - internal - 5.25" - LightScribe
At first the bios would hang with a Post of 4h. The computer would boot as soon as I
plugged in the power supply. After it hung, it would reboot and the cycle would continue
indefinately. Researching, people with the 4h hang in the boot said I needed to update the
bios to accomodate the i5 processor. Because I could not get to the bios screen, I pulled
the bios pin on the CPU, copied the updated bios using *.bio, inserted the disc. The
computer immediately booted when I plugged in the power supply. The Post got to 33. The
computer then rebooted and the cycle continues endlessly. The computer is reading the ROM
drive with the cd. I tried removing the video card. Same result. I tried unplugging the
LED, Power on etc. from the MB. Same result. I tried removing and installing only one RAM
card. Same result. I removed all the RAM same result except it hung at Post 27. I even
tried unplugging the HD. Same result. I removed and reinstalled the CPU. Same result.
I can't get the computer to reach the bios screen. I can't get it to stop booting as soon
as the PSU is plugged in. I can't get it to stop recycling.
Obviously I am not getting any video on the monitor.
Connect a speaker to the motherboard from the case, or use a separate tiny speaker that comes with new cases. Atatching the external speakers won't work. You need to hear some beep codes or lookup the 4H code in the motherboard manual. Should be listed at the back of the manual under troubleshooting. Then reset the bios using the cmos jumper or remove the board battery for a few seconds with the system off. The cmos jumper can be moved over one pin keeping 2 out of 3 pins covered, then return to original position. Reseat (reinstall) the following: ram, video card, and power supply 24 pin atx and 4 or 8 pin 12v lead to the motherboard. Disconnect all the optical and hardrives to see if you can get a post screen. If it appears, press an "f" key usually listed to enter the bios and set the boot order, save and exit. Then you can connect the drives, format, and install windows. Without a fresh install, windows usually recycles (reboots). It can't find the new motherboard drivers until you format and do a fresh install.
In searching the internet, I was surprised to see how many people had the exact same problem with this motherboard and the i5 CPU. In the end, with the CMOS jumper still off, I decided to pull the CMOS battery, wait a half hour, replace the battery and try to flash the bios with the latest version in *.bio format on a thumb drive connected directly to a USB port on the motherboard. It worked. Put the CMOS jumper back on and rebooted.