hi, I've changed my MOBO to Gigabyte.. for some reason, when i tried to enter into BIOS, it doesn't. I cud see "press DEL to enter setup" message... This screen is only up for two seconds before it flashes to the POST screen which then flashes into a screen that says "Loading Operating System". Then it loaded my OS.. Then i restarted my computer and tried to enter into BIOS again... This time I entered into BIOS.. Sometimes, it is not entering into BIOS (as I've pressed DEL so many times before the BIOS entry msg).. why it is happening sometimes ?? plz help... 
My Computer
At a glance
Windows 7 Ultimate 64-bit SP1AMD Athlon II X2 260 @ 3.2 GhzKingston 8.0GB Dual-Channel DDR3 @ 669MHz (9-...ASUS EAH 5450 - 1 GB
- Computer Manufacturer/Model Number
- Assembled
- OS
- Windows 7 Ultimate 64-bit SP1
- CPU
- AMD Athlon II X2 260 @ 3.2 Ghz
- Motherboard
- Gigabyte Technology Co., Ltd. M68MT-S2 (Socket M2)
- Memory
- Kingston 8.0GB Dual-Channel DDR3 @ 669MHz (9-9-9-24)
- Graphics Card(s)
- ASUS EAH 5450 - 1 GB
- Sound Card
- Realtek HD Audio
- Monitor(s) Displays
- 23 Inch - DELL SP2309W
- Screen Resolution
- 2048 x 1152
- Hard Drives
- 488GB Seagate ST3500418AS ATA Device (SATA)
- PSU
- 450W
- Case
- Iball - Standard Form - i8190
- Cooling
- Stock Cooling
- Keyboard
- Logitech
- Mouse
- Logitech
- Internet Speed
- 1 MB/Sec
- Other Info
- Creative Inspire 2.1 Speakers, LITEON 24x DVD Writer