How to reformat SSD for Win 7 reinstall, after permanent boot failure.

It's good to discover the existence of what seems to be such a helpful forum, which I hope can help me to restore my Win 7 Core i7 laptop.
Symptom: Won't boot from what I deduce is the C: SSD drive, with larger D: HDD.
Story so far: I've gone through all the boot restoration utilities, including command line procedures, after booting from either bootable USB stick drive and/or CD installation discs.
Advice please: I think I have previously backed up all the data I need from drive D:, but even if I hadn't, do I need only to reformat the SSD into a new blank bootable drive before reinstalling Win 7 from the CDs that came with the laptop?
Finally: How do you actually make the current unbootable SSD into a bootable C: drive ready for Win 7 re-installation? Will the D: HDD drive contents remain safe?

Thanks.

Welcome to the forum. You always remove d when doing an install so it doesn't have boot files put on it. Boot the install media when it asks were to install it gives you the option to delete all partitions do that and let windows create what it needs

Thanks for the rapid response. Do you mean physically remove/unplug the HDD, or is there a software switch which ignores or deletes physical D: partition? Sorry, I'm a bit nervous since I've never had to do a complete reinstall following a crash, especially on a machine that has SSD as boot drive and HDD for data/recovery.

Would be much obliged if you can help clear the fog a little more before I press the GO button!

Thanks

Just pull the power lead from the second drive. We get so many people that leave the second hd in and windows puts the boot files on it so you cant then boot without the second drive

If your data is on the HDD, first thing to do is to remove the HDD so you don't loose your data.
Unless you have a serious hardware or software issue on the SSD, you can make it boot again.
Could you explain what happen or what did do that made the SSD un boot able?
Did your Laptop came with the SSD and the HDD? Did it came with Win 7?
Did you changed any BIOS settings?

Thank you both for your input. Sounds as if I need to open the base to unplug HDD power. Yes the laptop came with SSD and HDD already with Win 7 already installed. This laptop has reverted to being my second machine but being an i7 gaming model, I don't want to lose it. I also have another similar more recent model which came with same structure but with Win 10.
The problem with the laptop in question is that it often auto closed down because of suspected overheating (fan?). However recently it began to permanently fail to reboot. As mentioned before I've been through all the routines to try to restore without full reinstall. If I can resolve the overheat problem (replace fan?), I thought I might be able to upgrade it from Win 7 to Win 10, since I still feel this is a worthy machine to keep operational.
The only BIOS settings changed has been to define order of boot device.

Thanks for any other comforting comments.

If it shut ed down while running, you should do a check disk.
Boot from a win 7 (or 10) installation disk, go to repair and open a CMD window.
Type chkdsk c: /f
Once finished type chkdsk d: /f

Did you try the boot repair from win 7 installation disk?

I've got as far as taking base cover off to expose HDD, SSD, and fan. I thought I would also see gaming video card with another fan, but perhaps that's for desktops. There is a lot of copper strip heatsink around presumably covering the processor and perhaps the video chip? Anyway, booting with the installation discs and running laptop on its side like an open book, it has been running all day with a static screen, where the fan has been constantly running, and there has been no power down event.

I ran chkdsk c: /f and had lots of what seemed like successful tests. This included "0KB in bad sectors. However, on completion it said "Failed to transfer logged messages to the event log with status 50".

I ran chkdsk d: /f This time it indicated "The type of file system is UDF. Windows cannot run disk checking on this volume because it is write protected.

I ran the startup repair from win 7 installation disc. After going through some routines, it stated "Startup repair can't repair this computer automatically".

I'm afraid this does not mean very much to me, except it may indicate that at least the SSD is capable of reliable operation after a reformat?
I'm not sure why the D: drive can't be read though. In a previous test, I was able to use a pseudo windows file explorer to see folders and files on the equivalent of the D: drive. It looks a bit fiddly to remove the HDD, but when I have done this, do I just run the installation disc, or do I have to do a CMD line instruction to format the SSD into a bootable drive first?

Thanks again for your helpful assistance.

After removing the HDD, just do a clean install.
Boot with the win 7 installation disk, go to install - Advanced - delete ALL partitions - create new and install on the NTFS partition.
Clean Install Windows 7 - Windows 7 Help Forums
When it finish installation, don't update. Open device manager and look for the missing drivers.
Once you have all drivers, do the updates. MS releases SP2 for Windows 7 - Windows 7 Help Forums
When all the updates are installed, shut down and put back the HDD.

Oh dear, I guess once you've started 'brain surgery' you have to carry on until the bitter end! I did extract the HDD ready to take your advice for the next step. Incidentally, I think I also found a reason for overheating, since removing the fan enclosure, although operational, the surrounding in/out ports were stuffed with thick dust! So, this success encouraged me to continue. Unfortunately, going through the routine of reinstall hasn't got very far, since it thinks that the only available drive has only 8Mb available. "Disk 0: Unallocated space 8.0MB. Windows can't do installation on this disc (needs 12093MB)"

I reverted back to your earlier tests but now get with chkdsk C: /f - "canot open volume for direct access"
With chkdsk d: /f I get same as before that "file system is UDF and is write protected.

I can only assume that the HDD is somehow required for reinstallation.
Before I plug it back in, I'll try some of the UBCD utilities to see if I can somehow reformat the SSD before trying again. Is there a DOS cmd to do this?

I guess you may now getting fed up with this thread. If so I quite understand if you've run out of further ideas. If I have to buy a new SSD to at least save an operational laptop, that's what I will have to do.

Many thanks for your patience and help.