Unable to access BIOS Setup

I have a strange problem. I installed a new drive and an additional 1G of memory, upgrading from 40G of storage to 200G and from 1G of memory to 2G. I have a Dimension 4700. After adding the devices and booting the system I get Memory has changed, F2 to run setup. OK, I have done this before. I press F2 and my system goes into sleep mode, my monitor goes blank and my power and hard drive light comes on and stays on. Nothing else happens. I can Ctrl + Alt + Del and restart the system but F2 gives me the same results. OK, I will unplug the memory and the new hard drive and boot again. No change in the F2 function. It appears that my system simply goes to sleep. So, I decided to reset the CMOS with turning on all lights (Caplock, Numlock, Scrolllock, etc.) you know the routine. I get the correct beeps etc. everything is set to factory default. I boot get the F1 no floppy, expected since I do not have one or F2 for setup. I F2, same sleepy problem. OK, lets pull the battery. I power down remove the power plug, open the case, remove the battery and head to the gym. Got a routine I must adhere to. When I return I replace the battery, pluge in the power and the system boots. F1...F2... I F2, same problem. So now, I decided to put the memory back into the system and reconnect the hard drive and let the system fully boot. The system is up but the clock is off, expected, memory looks good, the additional hard drive is detected, but I lost my two DVD drives. To make a long story shorter, I am unable to access Setup during boot in order to reset the clock and detect the DVD drives. I have never seen this before. Has anyone else? One other thing, I updated the flash BIOS from A05 to A10. No luck.