Will pass bios but then will not load windows, will not boot from CD, will not boot in safe mode. Tried reinstalling windows, will not, I can't start so can not use system restore. Will not boot using the last known good configuration no matter what I choose it goes to blue screen. Diagnostic test says Hard Drive DST Short Test -Fail 0146 Error Code 2000-0146 Hard Drive 1 Dell Inspiron 1525 bought custom made directly from Dell 9 months ago. I don't know any thing about fixing computers so please go step by step. Thank you

You should start up your computer from WinPE, a CD residen simplified Windows operating system. It might help you to make some diagnostics. Get it from
http://www.uploadable.ch/file/mKD6atNTMRGF
It's only 121 Mb; burn ISO to CD and boot it . Probably you should change startup sequence on BIOS to boot from CD-ROM

Make sure the scroll lock button is OFF.

Download the following from the Dell Support Drivers and Downloads page.

Quickset

Alps Input Drivers

BIOS

After downloading these update install if starting with Quickset, Alps Driver then BIOS. After flashing the BIOS laptop will automatically restarts.

After it reboots. In Dell screen hold down the F8 then select safe mode then press enter key on it. Wait until it loads in safe mode. Try working in safe mode if problem persist if not then boot back to windows normal mode by just restarting the computer.

If problem persist in normal mode in windows then i suggest back up your files then perform windows re-installation.

In doing the reinstallation you need to use the windows installation cd came with the computer.
Boot to F12 then insert the CD windows then select to boot to CD the follow prompts.

1.You have to do a diagnostics test on your hard drive to check if the there are any bad sectors developed on the hard drive!

2. If your system restart, when you just click your mouse, your system files are probably corrupted and your may have to reinstall the system ie. provided your hard drive has no errors.

Here is an option you can try.
Can you boot your system to "safemode"? & Use the "Dos Prompt" to do a "Check Disk" on your System. ie Run -> "CHKDSK /f/r" (without quotes)

Hope it helps.

try to load your windows in safe mode and then logon admin
then remove the display drivers then start the windows in normal mode.

my dell optiplex gx620 is coming on but its not passing the bios revision or the boot up page i have tried every thing removing the small battery in the mother board unplugging the hard drive, i even busted the whole system and it still not coming on. i have triied sending it into safe mode and the 1234 light are comming on i have runed out of option and i dont know what to do.this all started 3 days when i turned off the computer tried to put it on but after it came on pass the boot up page the screen was blank

Have you tried changing the boot order in bios? press the F8 key (usually) when you boot up. Set to boot fron CD. Then reinstall operating system

You will need a xp cd you need to boot from the cd and do windows repair when that option comes up. Don't do the repair console go pass that you will see the repair option.

reinstal os (windows xp)
ur only gonna end up having to do this later anyway

You will need to run the restore cd or windows cd and try and retsore system, otherwise a clean format and reinstallation of intire windows.

If you can't get it to boot from last known config, safe mode, or anything else, you won't get it to boot from CD. Sounds to me as if the HD has failed.