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No boot sector in internal Hard disk.
No bootable devices - strike F1 to retry boot, F2 for setup utility
Press F5 to run on board diagnostics.

My Dell Inspiron 1525 doesn't boot at all. During start-up, I get the above error message each time. I've already phoned Dell and they told me to replace the drive with a new one. SU and some other tech forums also support this. So, I've replaced the HDD. Still, I get the same error.

I have a thought that my BIOS doesn't recognize my HD still. I've already checked the setup utility. Then, I used my XP CD to install a new copy. The boot sequence has the DVD-RW at the top followed by HD. But sadly, It doesn't recognize the CD too. Then, I made a bootable USB using WinToFlash and now, it doesn't recognize the USB too. What would be the case?

Do I have to replace my new HD too?

Note: My question is probably related to this one already been asked here - Dell Inspiron 1525 - Internal hard disk drive not found. But, the answer wasn't helpful to me. I mean, it didn't work for mine...

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Have you selected F5 to try thge diagnostics? Possible Motherboard issue so F5 would be a good start. Failing that, a bootable diagnostic tool would help. Many forums outline the process. One her en.community.dell.com/support-forums/laptop/f/3518/t/… –  Dave M Jan 9 '13 at 13:42
    
@DaveM: Hi Dave. Yeah... That thing ran for nearly 40 mins. It was of no use. Thanks for your link. I'll check that out :-) –  Waffle's Crazy Peanut Jan 9 '13 at 13:46
    
I assume that the pc isn't under a warranty period? –  Ramhound Jan 9 '13 at 14:03
    
@Ramhound: Hi Ramhound. Yes. It isn't. And that's my irritating problem :-) –  Waffle's Crazy Peanut Jan 9 '13 at 14:06
    
What happens when you look at the disk with diskpart or fdisk. Does it have a bootsector? (If not fdisk /mbr should rewrite one). –  Hennes Jan 9 '13 at 14:10

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