Invalid Partition Boot Sector??

Hi all,
I've just completed the build of a new PC. Post resetting the CMOS I get the AMI screen which shows the BIOS details, below which I see a ', 2GHz'(?) and below this is 'CMOS settings wrong'. If I select default settings I then get 'Invalid partition boot sector and Press any key to restart loading OS'. When I press a key the Intel Boot agent tries to link up(?) and fails.
When I reset the system, I get a no post and my DVD drive light flashes peridically. Placed a boot up CD in the tray and tried resetting and now the PC reboots itself every 30secs or so.
The only way I can get a Post is to continually reset the CMOS.
I have the D-LED's and they typically show LED's 1+2 alternating green/red and 3/4 red.
My system is as below:
MSI 875p NEO(BIOS V3.3)
Intel 3.2 GHZ CPU (Northwood) Not overclocked
2-512Mb DDR 400 OCZ PC3200
NVDIA GeForce2(32MB)
1 x 120G seagate drive(Slave, Non-SATA)
1 40gb Western Digital(Master, Non-SATA)
Hitachi DVD ROM
Sony DVD R
Antec TruePower 380W
Creative Soundblaster5.1
LAN card

Hi again,
Okay. Tried suggestions however still no joy(can't overwrite with XP as DVD drive won't read). I've listed below what my PC currently Can/Can't do:
Can.
1) Only after resetting CMOS, can boot to the A: prompt using a floppy drive(only when selecting F2 defaults from Post)
2) Only after resetting CMOS, can boot to Seagate HD utility(using floppy) and setup new HD ready for OS install. Then asks to reboot and PC doesn't post.
3) Perform as an expensive door stop
Can't
1) Never posts once the PC has been reset from 1) or 2) above.
2) Never posts after I enter the BIOS setup(regardless of what I do)even if I set the defaults which works if I press F2 from Post screen.
3) Read from my DVD drive. Spins the drive up and never seems to read from it.
4) Boot from my old HD(invalid partition). Is this because the HD was setup with a different chipset as indicated in prior replies?
I would really like to know if my processor/memory is okay. Can I assume that as the PC can get to the OS boot part that the CPU/Mrmory checks pass and they are good?

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The ultimate solution is to install Windows from beginning either by using CD/DVD or USB bootable flash drive. You need to have windows installation disc or bootable flash drive for that.
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aiaf wrote:
Hi All,
My W520 motherboard died on me which has now prompted to purchase a new laptop due to high repair cost.
I've taken out my 320 GB HDD from my Lenovo W520 and attached it to an external USB case in attempts to salvage my files.
When I attempt to open this harddrive on Windows, it tells me that the disk must be formatted to be accessible etc.
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Invalid Partition Boot Sector??

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