crwdns2936637:0crwdne2936637:0 crwdns2853008:0crwdne2853008:0 crwdns2918746:0crwdne2918746:0
crwdns2918538:0crwdne2918538:0

crwdns2934243:0crwdne2934243:0 mayer

crwdns2934249:0crwdne2934249:0:

Your hard drive cannot find an appropriate OS. Let's start here: go to this kink and identify exactly which machine you have:
https://everymac.com/ultimate-mac-lookup/?search_keywords=m5521
UPDATE
I believe this is your machine:
https://everymac.com/systems/apple/imac/specs/imac_se_dv_400.html
Pre-Installed MacOS: 8.6 Maximum MacOS: X 10.4.11
Do you have original installation disks?
Do you have retail system version disks?
Are your disks machine specific grey disks?
-UPDATE
+'''UPDATE''' 5/29/18
If you do not have the system software. you can find it on eBay by searching for
+
Apple Mac OS X 10.4 Tiger - Full Version for Mac
+
Here's one https://www.ebay.com/itm/Apple-Mac-OS-X-10-4-Tiger-Full-Version-for-Mac/332665816922?epid=127620286&hash=item4d746d875a:g:WLwAAOSwLnBX-Sx2:sc:USPSFirstClass!79423!US!-1

crwdns2915684:0crwdne2915684:0:

open

crwdns2934245:0crwdne2934245:0 mayer

crwdns2934249:0crwdne2934249:0:

Your hard drive cannot find an appropriate OS. Let's start here: go to this kink and identify exactly which machine you have:
https://everymac.com/ultimate-mac-lookup/?search_keywords=m5521
UPDATE
I believe this is your machine:
https://everymac.com/systems/apple/imac/specs/imac_se_dv_400.html
Pre-Installed MacOS: 8.6 Maximum MacOS: X 10.4.11
+
Do you have original installation disks?
+
Do you have retail system version disks?
+
Are your disks machine specific grey disks?
+
+UPDATE
+
+If you do not have the system software. you can find it on eBay by searching for
+Apple Mac OS X 10.4 Tiger - Full Version for Mac
+Here's one https://www.ebay.com/itm/Apple-Mac-OS-X-10-4-Tiger-Full-Version-for-Mac/332665816922?epid=127620286&hash=item4d746d875a:g:WLwAAOSwLnBX-Sx2:sc:USPSFirstClass!79423!US!-1

crwdns2915684:0crwdne2915684:0:

open

crwdns2934245:0crwdne2934245:0 mayer

crwdns2934249:0crwdne2934249:0:

Your hard drive cannot find an appropriate OS. Let's start here: go to this kink and identify exactly which machine you have:
https://everymac.com/ultimate-mac-lookup/?search_keywords=m5521
+
UPDATE
+
I believe this is your machine:
+
https://everymac.com/systems/apple/imac/specs/imac_se_dv_400.html
-Pre-Installed MacOS: 8.6 Maximum MacOS: X 10.4.11
+Pre-Installed MacOS: 8.6 Maximum MacOS: X 10.4.11
+Do you have original installation disks?
+Do you have retail system version disks?
+Are your disks machine specific grey disks?

crwdns2915684:0crwdne2915684:0:

open

crwdns2934245:0crwdne2934245:0 mayer

crwdns2934249:0crwdne2934249:0:

Your hard drive cannot find an appropriate OS. Let's start here: go to this kink and identify exactly which machine you have:
https://everymac.com/ultimate-mac-lookup/?search_keywords=m5521
+UPDATE
+I believe this is your machine:
+https://everymac.com/systems/apple/imac/specs/imac_se_dv_400.html
+
+Pre-Installed MacOS: 8.6 Maximum MacOS: X 10.4.11

crwdns2915684:0crwdne2915684:0:

open

crwdns2934241:0crwdne2934241:0 mayer

crwdns2934249:0crwdne2934249:0:

Your hard drive cannot find an appropriate OS.  Let's start here:  go to this kink and identify exactly which machine you have:

https://everymac.com/ultimate-mac-lookup/?search_keywords=m5521

crwdns2915684:0crwdne2915684:0:

open