Why wont Windows 7 boot?

November 2, 2020 at 20:12:00
Specs: Windows 7, Pentium D/2GB
Dell Dimension 9150
Windows 7 and XP

I replaced the system battery 2032 and everything went downhill from there.

When it booted, a msg came up: “corrupt file at startup, cannot start up Windows 7”

I tried using Win7 repair on installation CD and the various “corrupt file at startup, cannot start up Windows 7” solution from various websites although I managed to fix bootrec.exe files at command prompt.

But now, its: booting up Win7 → splash screen, then it reboots by itself, returns to boot manager (dual boot setup) , I hit enter → splash screen, reboots…..and on and on it goes.
I tried booting WinXP on other partition, still the same.

I have 2 backup hd’s, each with Win7 & XP installed and swapping them didn’t help.

There’s nothing wrong with hd’s as they can be read on the hd backup docking stations.

I even swapped old battery but still the same.

I know its an old pc but it serves me just fine.

So, any ideas?

See More: Why wont Windows 7 boot?

November 2, 2020 at 20:23:09
If you can get into the bios, click on setup defaults. F10 to save.

If that doesn't do the trick, see if this gets things working.

How to use a Lazesoft Windows Recovery CD or USB device to fix the boot problems if your Windows operating system does not start correctly.
"It is very common for PC users to be faced with a Windows crash. When this happens, the dreaded 'Blue Screen of Death' pops up, or your PC has a black screen and can not boot or start up"

Lazesoft Recovery Suite Home
Screenshot ( SS )
Lazesoft Recovery Suite Home video tutorial
How to Boot a Computer from a Lazesoft Recovery USB Device
How to Burn a Lazesoft Recovery CD

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November 3, 2020 at 06:03:39
"I replaced the system battery 2032 and everything went downhill from there"

The battery is the backup power to the CMOS chip so that the BIOS settings are retained in memory when the system is shutdown. Once the battery is removed, there's no power to the chip & all the settings are lost. If the battery is removed/replaced, the BIOS then needs to be reconfigured. Entering the BIOS setup menu & "loading defaults" is only part of what needs to be done, you also have to correct the date & time. And there's a possibility that other settings will have to be changed as well. Be sure to save your settings before you exit.

message edited by riider

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November 3, 2020 at 16:14:15
If you don't have your manual, here it is.

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November 3, 2020 at 17:19:37
I can get into BIOS anyway because I had to change date etc.
Will try "loading defaults"

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November 3, 2020 at 17:22:35
I could get into BIOS anyway to change date etc.
Will try "defaults" F10

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November 4, 2020 at 05:33:25
Defaults doesnt work.

I forgot to mention a BSOD appears but then vanishes.

Should I try UBCD?

JohnW, I already have manual - the 4-green-light diagnostics dont help any.

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November 4, 2020 at 06:27:53
"Defaults doesnt work"

Defaults are never 100% correct. They're a starting point or a fallback point if you mess up when manually configuring. Are you familiar BIOS settings? Run thru them all one by one & adjust as needed. Being that you're working with a Dell, the settings won't be too complicated. They're broken down in the link provided by Johnw, also here: http://www.l3jane.net/doc/9150/syss...

Why did you change the battery in the 1st place?

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November 4, 2020 at 16:03:57
I am quite familiar BIOS's.

I replaced battery because on bootup was msg something like:

System battery low voltage
Strike F1 key to continue, F2 to run setup utility

So I presumed it meant it was going flat.

But the question I have is: how or why did the battery swap get to this point when all I did in BIOS was change the time and date?

I'll go through the System setup and come back.

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November 4, 2020 at 16:05:33
Btw, that msg doesnt appear anymore.

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November 4, 2020 at 16:50:17
"Should I try UBCD?"

If you have tried Lazesoft in my post #1 ( which has a huge amount of choices, including command prompt )
Yes, try UBCD.

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November 5, 2020 at 01:22:22
have you set the time and date in BIOS?
Can Windows boot in Safe Mode?

message edited by sluc

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November 7, 2020 at 17:57:34
Yes and yes - no difference.

On a go-slow at the moment...

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November 7, 2020 at 18:25:46
"On a go-slow at the moment"
When slow, have a look in Task Manager & see what is gobbling up your resources.

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November 14, 2020 at 01:39:13
1 - How can I look in Task Manager if I cant boot into Windows?

2- What I meant buy "go-slow" was, look at it later.

Which brings to this: I lost interest, too hard-basket, buy another pc and might look at problem sometime "later".....

Thanks for all the replies, sorry to keep everyone in suspense.

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November 14, 2020 at 05:49:49
Dell BIOS settings are minimal so it shouldn't be too difficult to figure out. I provided a link in response #7 that lists all the settings & what they're for, it even tells which settings are the defaults, did you look at it? It also explains "Clearing CMOS Settings" at the bottom of the page.

Start by unplugging the power cord & using the CMOS jumper as explained. Then boot up, enter the BIOS & correct the date/time & the rest of the settings. Save & exit. Hopefully the system will boot into Windows afterwards. If not, have you considered that the HDD might have died? See if it's listed in the BIOS, also make sure the boot sequence is correct.

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November 22, 2020 at 19:48:24
Okay riider, I'll give it ago.

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