PC won't boot

Not sure if this is the right place to post this. When turning on the computer it shows the first screen .. Big E and bottom right corner says Boot (F10) Bios (F2) .. it hangs there for a few minutes then just goes to a black screen and just stays that way. There are no beeps or error codes. Only thing that has been done to this computer is RAM upgrades. I've taken all the Ram out which causes the error beeps. There are four memory slots. I have four sticks. First I took one out leaving 3 in.. turned PC on got same screen. Repeated this for each stick. Then I took all off the sticks out and I took each one and put one into the first slot, same thing, put second into first slot, same thing, third.. fourth, same thing. So I'm assuming it's not the RAM? Haven't done anything else to this PC. Only thing it was used for was web surfing and playing RPG game called DAoC. Hope I provided enough info. Any help would be great!

Computer Info.

Emachine - T6532 Series
Only info on MB I could get was MS-7207 K8NGM2 H .. which was printed on the motherboard.



CPU: AMD Athlon™ 64 3500+ processor with AMD 64 Technology
(2.2GHz, 2000MHz system bus, 512KB L2 cache)
Operating System: Genuine Microsoft® Windows® XP Media Center Edition 2005

Chipset: NVIDIA® GeForce® 6100
Memory: 1024MB DDR (2 × 512MB), 400MHz (PC3200), dual-channel Expandable to 4GB
Hard Drive: 200GB (7200rpm, 2MB cache)
Optical Drive: 16x multiformat dual-layer DVD±RW
(Up to 8.5GB with dual-layer media)
Write max: 16x DVD±R, 6x DVD-RW, 8x DVD+RW, 4x DVD+R DL, 40x CD-R, 24x CD-RW
Read max: 16x DVD-ROM, 40x CD-ROM
Media Reader: 9-in-1 media card reader (Memory Stick®, Memory Stick Pro®, MultiMediaCard™, Secure Digital™, CompactFlash®, MicroDrive, SmartMedia, xD, USB 2.0)
Video: NVIDIA® GeForce® 6100 GPU
Up to 128MB of shared video memory
PCI Express (PCIe x16) slot available
Sound: 6-channel (5.1) high-definition audio
Network: 10/100Mbps integrated Ethernet LAN (RJ-45 port)
Modem: 56K ITU V.92-ready fax/modem (RJ-11 port)
Peripherals: Premium multimedia keyboard, 2-button wheel mouse, amplified stereo speakers
Ports/Other: 5 USB 2.0 (1 in digital media manager, 4 in back), VGA external connector, parallel port, 2 PS/2 ports (keyboard and mouse), 5 audio ports (2 in front, 3 in back)
Dimensions: 14.25" H x 7.25" W x 16" D
Weight: 22.5 lbs

NOTE: I tried taking out the battery.. waited 30 seconds then put it back in.. didn't change anything. I did try putting in another battery from another Emachine which was same voltage an what not and it didn't change either.

Another thing I tried was using another hard drive to see if SOMETHING would change. First Hard drive I tried it gave me an error saying it could not find hard drive. Tried a different hard drive and then it tells me CMOS CheckSum Bad. When using either of these hard drives though it did allow me to access the F2 and F10 keys to change boot setup or go into BIOS which the original wouldn't allow me to do anything. Not sure if that helps any.