Optiplex gx150, media test failure>strike f1 to retry boot, or F2 for setup utility

Hi, I've been trying for hours to fix a problem with my pc (dell optiplex gx150). I recently bought a new ram sdram 256mb, in order to make my pc have a total of 512mb ram. I installed the ram and the text of the bios screen got like misplaced in some colors. Anyway I removed the new ram changes the position with the old ram and started the pc. This time bios started ok and showed a message the memory size has changed. After that I got this message saying: Media test failure and the next screen saying: strike f1 to retry boot, or f2 for setup utility. I tryed f1 a few times but nothing luck. Then I pressed f2 and it showed me the bios screen. from there i could see the memory info, which it was ok because it was showing 512mb. But at the Boot sequence it displayed: hard disk drive (not detected)and unknown divice (not detected) the cd rom and floppy drive are ok no problem with them. Now I thought formating the HDD so i inserted the windows cd and I was able to see hdd partitions and i formated them, but as soon as the format was done, and files were been copied, the setup started from the beginning. I removed the cd but still the same error: Media test failure>strike f1 to retry boot, or f2 for setup utility. Can anyone help me please, what did I do wrong, or what's wrong with my pc. Thank you very much in advance
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More about optiplex gx150 media test failure strike retry boot setup utility
  1. Open the unit back up and make sure the drives cables are still connected at the drive and on the motherbd.
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