[HELP] Computer hang's when Entering the BIOS Settings!

First, let me apologize if I'm just a Newcomer and already asked for Help. I don't know where to go, I posted this query on some Local Technical Forum on my Country, Yahoo Answer's & The Manufacturers Technical Assistant. But the problem still persists. I read a lot of Threads with a little similarity on my Problem via googling and I noticed that most of the threads came here @ tomshardware. So I decided to registered and hopefully this will put a Period on my problem. This is how it goes...

I have a problem accessing my BIOS SETTINGS on my Gigabyte H61M-DS2 (Rev 2.1). Every time I press on any of the Function Keys during the POST it will HANG like forever. In other words I cannot access the BIOS Setup for some Unknown Reasons. I can log on to Windows, I can browse the Net & Play Games. So far no Generated Error from the System.

I Bought this computer just a week ago, I examined it Including the BIOS Settings to familiarize myself and It works Perfectly. However the OS is not included on the package so I installed an OS when i got Home. I immediately divide the HDD into 2 Partitions to separate Large Sized Programs & Games to the Local C:. At the moment I have the Local C: and the Partition Drive H: on my HDD.

So, I restarted the PC and decided to take a look back on the BIOS Settings to make myself familiarize on the new BIOS Environment. But then when I pressed DEL or any of the Function Keys during POST my computer Hangs. I don't know whats the root of this problem. The Gigabyte Technical Support say's, to clear my CMOS by removing the battery for about 20 minutes or use a Jumper thing that I don't know. I didn't change any settings on the BIOS, I never attempted to update it, I just install an OS, Games and softwares. Browse the net, Play Games, that's how my computer works.

Again, I just would like to make it clear that I can log-on to windows, no beeping while the computer is starting, no System Error when i Logged on to Windows, I can browse the Net, I can play Games like nothing to worry.

Here is my Computer Specification:

OS: MS Windows 7 Home Premium 32-bit
CPU: Intel Pentium G620 @ 2.60GHz Sandy Bridge 32nm Technology
RAM: 2.00 GB Single-Channel DDR3 @ 532MHz (8-8-8-20) Crucial Technology PC3-10700H (667 MHz)
Motherboard: Gigabyte Tecohnology Co., Ltd. H61M-DS2
Graphics: Intel HD Graphics
HDD: 488GB Seagate ST500DM002-1BD142 ATA Device (SATA)
ODD: TSSTcorp CDDVDW SH-222BB ATA Device
PSU: Power Choise 580W (not a generic PSU but i don't know if it is a good PSU for my RIG)

And here is the List on what I tried:

1. Removing the BAT for more or less 20 minutes.
2. Disconnecting the SATA cable of my HDD (There were times it didn't hang and if I pressed DEL it ask me to Insert Bootable Disc or Something..., but most of the case it hangs...)

The motherboard package comes with 2 SATA cables, 1 is attached on the HDD, and the other 1 is attached on the ODD.

Thank You! and you replies is very much appreciated.

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Let me add a Few additional Information...

I am trying to access the BIOS Setup here ~> http://img802.imageshack.us/img802/6707/splashscreenz.p... <~ by pressing Delete key. This is the first image that pop ups when I power on my Computer.

And, I am wondering why I do not see this ~> http://img198.imageshack.us/img198/9587/postmo.png <~ every time I start my computer.

After the splash screen of the Motherboard, there were times that windows will immediately load, but there were times that there is a black screen with blinking underscore _. Then windows will load after that...